A GEMSTONE WITH A HEART SHAPE AT THE CENTRE AND ITS METHOD OF MANUFACTURE

Abstract

The invention discloses a round or a heart shaped gemstone (FIG. 1) (FIG. 8) visually encompassing a heart shape (FIG. 7,15:AD) within, and its method of manufacture. The gemstone comprises of an upper double crown table facet (A), a lower pavilion (C) with a culet (D) at its lower tip, and a girdle (B) separating the upper crown table facet from the pavilion. The pavilion (FIG. 1) comprises of pavilion main facets, lower girdle facets and short half facets. The short arms (P) of the kite shaped pavilion main facets meet at the culet, long arms (Q) meet at 1.sup.st points (R) and the short arms and long arms of each pavilion main facet meet at 2.sup.nd points (S) at specific girdle depths. The lower girdle facets (L) and the respective short half facets (T) are faceted from the lower girdle facets at 1.sup.st pavilion angles along a cable (R) joining the 1.sup.st points. The 2.sup.nd pavilion short half angles (Z) along a cable joining the 2.sup.nd points of the pavilion main facets are less than the 1.sup.st pavilion angles. The girdle depth of the 1.sup.st point of one pair of symmetrical pavilion main facets is 0.5% to 10% less than the remainder pavilion main facets.

Claims

1. A gemstone visually encompassing a heart shape within, comprising an upper double crown table facet having a plurality of upper crown-1 facets, equal number of upper crown-2 facets, approximately half the number of crown main facets and half the number of star facets as upper crown-1 facet, the star facets bordering a central-table facet; a lower pavilion with a culet at its lower tip, a girdle separating and distinguishing the upper crown table facet from the pavilion, girdle main facets around the girdle, the pavilion having: i. a plurality of pavilion facets below the girdle facet appearing to be arranged on either side of an axis line traversing the pavilion along a horizontal plane comprising of kite shaped pavilion main facets emerging upwardly from the culet having short arms meeting at the culet and long arms meeting at first points at a girdle depth ranging to 70 to 85%, and the short arms and long arms of each pavilion main facet meeting at second point at a girdle depth ranging from 80 to 96%, even number of substantially triangular lower girdle facets emerging downwardly from the girdle, pairs of substantially triangular short half facets with a common side, faceted from the lower girdle facets along a cable joining the first points, the lower girdle facet and the corresponding short half facet having a first common vertex at second points, pointing towards the culet, the pairs of short half facets alternating the long arms of the pavilion main facets; ii. a girdle facet angle in the range of 30 to 60, first pavilion short half angles, along a cable joining the first points being 0.01 to 8 less than the girdle facet angle, and second pavilion short half angles along a cable joining the second points of the pavilion main facets, such that the second pavilion short half angle is 0.01 to 8 less than the first pavilion short half angle; iii. the pavilion facets symmetrical to the corresponding pavilion facets across the axis line; iv. one of the two pairs of symmetrical short half facets having a common side along the axis line, being smaller than the other, and each of the pairs having a common vertex at a point where the axis line intersects the cable; v. and the girdle depth of the first point of one pair of symmetrical pavilion main facets, and the girdle depth of the cable where it passes through the common vertex of the larger of the pair of short half facets is approximately the same with a variance of not more than 15%.

2. The gemstone as claimed in claim 1, which is round, with the upper double crown table facet comprising of sixteen upper crown-1 facets, sixteen upper crown-2 facets, eight crown main facets and eight star facets.

3. The gemstone as claimed in claim 1, which is heart shaped having a notch and an oppositely located apex, and the axis line passing through the apex and the notch, and the upper double crown table facet comprising of sixteen upper crown-1 facets, sixteen upper crown-2 facets, nine crown main facets and eight star facets.

4. The gemstone as claimed in claim 3 wherein the crown main facets, comprise of a pair of crown heart 1 facet, crown head 2 facet, crown curve facet and crown wing facet, and one crown point facet, all of which are symmetrical to the corresponding main facets across the axis line.

5. The gemstone as claimed in claim 2, wherein the gemstone has four to twelve pavilion main facets, and double the number of lower girdle facets and short half facets.

6. The gemstone as claimed in claim 4, wherein the gemstone has four to twelve pavilion main facets, and double the number of lower girdle facets and short half facets.

7. The heart shaped gemstone as claimed in claim 6, with the girdle facet angle in the range of 43 to 48, the angle variance between the second pavilion short half angle and the first pavilion short half angle in the range of 38 to 42, is 0.3 to 5.0, and the angle variance between the first pavilion short half angles and the girdle facet angles being in the range of 1 to 7.

8. The round gemstone as claimed in claim 5, with the girdle angle in the range of 40 to 46 and the angle variance between the second pavilion short half angle and first pavilion short half angle is in the range of 0.5 to 5, and the angle variance between the first pavilion short half angles and the girdle facet angles being in the range of 1 to 5.

9. The gemstone as claimed in claim 7, wherein the gemstone has four pairs of symmetrical pavilion main facets and double the number of pairs of symmetrical lower girdle facets and short half facets.

10. The gemstone as claimed in claim 9, with the smaller of the pair of symmetrical small short half facets having one common side along the axis line, having sides opposite the culet facing vertex meet at a girdle depth approximately midway between the first point and the second point of the pavilion main facets (O.sub.4,O.sub.5) nestling the small short half facets.

11. The gemstone as claimed in claim 10, wherein the first point of the pair of pavilion main facets having the shortest girdle depth is immediately adjacent to the pavilion mains nestling the small short half facets.

12. The gemstone as claimed in claim 11, where in the gemstone is a diamond.

13. A method of cutting a round cut gemstone to encompass the shape of a heart, from the gemstone having an upper double crown table facet, a lower pavilion with a culet at its tip and having an axis line along a horizontal plane, and a girdle separating and distinguishing the pavilion from the upper double crown table facet, the crown table facet having a plurality of upper crown-1 facets, equal number of upper crown-2 facets, and half the number of main crown facets and star facets, the star facets bordering a central-table face; girdle main facets around the girdle, with at least four pairs of lower girdle facets, extending downwardly from the girdle with vertices facing the culet at a lower girdle angle in the range of 30 to 60, and arranged on either side of an axis line traversing the gemstone along a plane parallel to the table facet, cutting and polishing from pairs of lower girdle facets, half the number of pairs of symmetrical kite shaped pavilion main facets, each pavilion main facet having a pair of short arms meeting at the culet (D), long arms meeting at first points at girdle depths ranging from 70 to 85%, and the short arm and the long arm meeting at second points at girdle depths ranging from 80% to 96%, with the vertices of the lower girdle facets coming to be at the girdle depth of the second point, cutting and chiselling one pair of symmetrical pavilion main facets not having a common side along the axis line, to have a girdle depth at the first point to be less than the girdle depth of the remainder first points by 0.5% to 10%, optionally cutting and chiselling a pair of small pavilion short half facets from the culet end side of a pair of lower girdle facets having a common side along the axis line at first pavilion short half angle, along a cable connecting the first points of pavilion main facets adjacent to such lower girdle facets, such that the cable traverses through a point at a girdle depth midway between the first point and second point of the pavilion main facets nesting the pair of small pavilion short half facets so formed, further cutting and chiselling a second pair of lower girdle facets also having a common side along the axis line, at first pavilion short half angles from a point where the axis line emerges to the pavilion surface, at a girdle depth of the pavilion main facets having the least girdle depth with a variance of not more than 15%, along the cable, to the first points of the pavilion main facets adjacent to such lower girdle facets, forming a pair of pavilion short half facets, further cutting, chiselling and polishing the remainder lower girdle facets at first pavilion short half angles, along the cable connecting the first points, to form remaining pairs of pavilion short half facets with the common sides of each of the short half facets intersecting the cable such that pairs of pavilion short half facets are nested between the long arms of the pavilion main facets.

14. A method as claimed in claim 13 in which the first pavilion short half angles are cut and chiselled to be at least 0.01 to 8.0 less than the lower girdle angle, further cutting, chiselling and polishing the pavilion main facets along a cable joining the second points to form second pavilion short half angles, such that the second pavilion short half angle is at least 0.01 to 8 less than the first pavilion short half angle.

15. The method as claimed in claim 14, wherein the gemstone is cut, chiselled and polished to have four symmetrical pairs of pavilion main facets from eight pairs of symmetrical lower girdle facets and eight pairs of symmetrical short half facets, each facet in symmetry with the corresponding facet across the axis line, and the first pavilion short half angles being 2 to 8.0 less than the lower girdle facet angle, and further the second pavilion short half angle being 2 to 5 less than the first pavilion short half angle.

16. A method of cutting a symmetrically shaped heart shaped gemstone with a notch and an apex along an axis line on a horizontal plane, to encompass a heart shape design within, the gemstone having a plurality of upper crown-1 facets, equal number of upper crown-2 facets, half the number of star facets and half plus one number of crown main facets, the star facets bordering a central-table facet; a lower pavilion with a culet at the lower tip, a girdle separating and distinguishing the table facet from the pavilion, girdle main facets around the girdle, with at least four pairs of lower girdle facets arranged on either side of the axis line, and extending downwardly from the girdle with vertices facing the culet, at a lower girdle angle in the range of 30 to 60, cutting and polishing from pairs of lower girdle facets, half the number of pairs of kite shaped pavilion main facets, emerging upwardly from the culet having a pair of short arms meeting at the culet and long arms, meeting at first points at a facet depth in the range of 70 to 85%, and the short arm and the long arm meet at second points at a depth of % to 96%, with the vertices of the lower girdle facets coming to be at the girdle depth of the second point, the pavilion main facets in symmetry with the corresponding pair across the axis line, such that the girdle depth of the first point of one pair of symmetrical pavilion main facets not having a common side along the axis line, is less than the girdle depth of the remainder first points by 0.5% to 10%, optionally cutting and chiselling a pair of small pavilion short half facets from the culet end side of a pair lower girdle facets having a common side along the axis line at first pavilion short half angle, along a cable connecting the first points of pavilion main facets adjacent to such lower girdle facets, which traverses through a point at a girdle depth midway between the first point and second point of the pavilion main facets nesting the pair of substantially triangle small pavilion short half facets so formed, further cutting and chiselling a second pair of lower girdle facets also having a common side along the axis line, at first pavilion short half angles from a point where the axis line emerges to the pavilion surface, at a girdle depth of the pavilion main facets having the least girdle depth with a variance of not more than 15%, along the cable, to the first points of the pavilion main facets adjacent to such lower girdle facets, forming a pair of substantially triangle pavilion short half facets, further cutting, chiselling and polishing the remainder lower girdle facets at first pavilion angles along a cable connecting the first points, to form remaining pairs of substantially triangle pavilion short half facets with the common sides of each of the short half facets intersecting the cable such that pairs of pavilion short half facets are nested between the long arms of the pavilion main facets.

17. A method as claimed in claim 16, wherein the first pavilion short half angles are cut and chiselled to be at least 0.01 to 8 less than the lower girdle facet angles, and, further cutting, chiselling and polishing the pavilion main facets at second pavilion short half angles along a cable, connecting the second points, such that the second pavilion angles are at least 0.01 to 8.00 less than the first pavilion angle.

18. The method as claimed in claim 17, wherein the gemstone is chiselled and cut to have eight pavilion main facets, sixteen lower girdle facets and sixteen short half facets and further cut and chiselled such that the first pavilion short half angles at first points with facet depth ranging from 80-84.5%, are 1 to 7 less than the lower girdle facet angle, and the second pavilion short half angle at a facet depth of 88.5% to 91% is 0.025 to 3 less than the first pavilion short half angle.

19. The method as claimed in claim 15 wherein the gemstone is a diamond.

20. The method as claimed in claim 18 wherein the gemstone is a diamond.

Description

DESCRIPTION

Drawings

[0016] FIG. 1: The round cut gemstone side view.

[0017] FIG. 2: Table view of round cut gemstone

[0018] FIG. 2 a: Crown top side angle view of round cut gemstone

[0019] FIG. 3: Pavilion view of round cut gemstone

[0020] FIG. 4: Exploded view of Pavilion Main facets of round cut gemstone.

[0021] FIG. 5: Pavilion angles in side view of a round cut gemstone

[0022] FIG. 6: angles in pavilion view.

[0023] FIG. 6a: girdle depth of 1st and 2nd Point on Pavilion of round cut gemstone

[0024] FIG. 7: table view of round gemstone, showing heart shape in the centre.

[0025] FIG. 8: The heart shaped gemstone side view.

[0026] FIG. 9: Table view of heart shaped gemstone

[0027] FIG. 9a: Crown top side angle view

[0028] FIG. 10: Pavilion view

[0029] FIG. 11: Exploded view of Pavilion Main facets

[0030] FIG. 12: Pavilion angles in side view of a round cut gemstone

[0031] FIG. 13: angle variations of adjacent facets in heart shaped diamond.

[0032] FIG. 14: girdle depth of 1st and 2nd Point on Pavilion.

[0033] FIG. 15: table view of round gemstone, showing heart shape in the centre.

[0034] In its main embodiment the invention describes a uniquely cut double crown gemstone preferably round cut (FIG. 1) or heart shaped (FIG. 8) which visually encompasses a heart shape within (AD at FIG. 7, 15). The round or heart shaped gemstone of the present description, as commonly available in commerce, as seen in its side view (FIG. 1 and FIG. 8) is divided in to 3 regions: i. The upper face which is referred to as the upper double crown table facet (A). ii. The girdle (B) which is the region below the crown table facet iii. The pavilion (C) which is the lower part of the gemstone, i.e. the region below the girdle. The girdle separates and distinguishes the crown table facet from the pavilion. The lower most pointed tip of the pavilion is referred to as the culet (D). The arrangement of pavilion facets is around the culet (D) and an axis line (C) that traverses the pavilion on the horizontal plane.

[0035] As seen in FIG. 2 & FIG. 9, the upper double crown table facet is comprised of a plurality of substantially trapezoid shaped Upper crown-1 facets (E), an equal number of substantially triangular shaped Upper crown-2 facets (F), kite shaped Main crown facets (G) where the long arms of the kite meet on the circumference (H) of the gemstone and triangular shaped star facets (I); The polygonal central table (J) at the centre is bordered on all sides by the star facets. There may be one or more girdle main facets (K) around the girdle. (FIGS. 1& 8)

[0036] The crown angles on the upper double crown table are at recommended angles as seen in FIGS. 2(a) and 9(a). The crown facet angles are usually in the range as seen in Table 1 below:

TABLE-US-00001 TABLE 1 Number Ideal angle Ideal angle of Angle For round range for Name of facet facets range cut Heart shape E1 to E16 16 35-48 40.00 40 Upper crown-1 F1 to F16 16 35-48 39. 39 Upper crown-2 G1 to G8 8 15-45 35.00 As below Crown main Crown curve G 2 30 to 38 NA 35 Crown head-1 G 2 32 to 40 NA 36.50 Crown head-2 G 2 32 to 42 NA 37.00 Crown wing G 2 33 to 40 NA 37 Crown point G 1 30 to 42 NA 34.50 I-1 TO I-8 8 15-30 20 22 Star facets

[0037] The crown angles are determined by viewing the diamond from a side profile and visually estimating the angle of the top portion of the diamond. In respect of a round diamond, the upper crown-1 angle cut is in the range of 35 to 48 and the respective preferred azimuth edge of the upper crown-1 facets are 11.25, 33.75, 56.25, 78.75, 101.25, 123.75, 146.25, 168.75, 191.25, 213.75, 236.25, 258.75, 281.25, 303.75, 326.25, 348.51. The Upper Crown 2 facets are at an angle in the range of 35 to 48. Upper Crown 2 facets are optional. Upper Crown 2 facets add more brightness to the stone. The Main crown facets are at an angle of 30 to 38 in relation to the upper crown 1 facet and the star facets are placed at 15 to 30. in relation to the central table. In respect of a heart shape diamond, the upper crown-1 angle cut is in the range of 35 to 48 and the preferred azimuth edge of the upper crown-1 facets are 6.5, 29, 41.5, 52.5, 63.10, 116.9, 127.4, 138.5, 151, 173.5, 207.5, 245.7, 267.4, 272.6, 294.2, 332.4 respectively. The Upper Crown 2 facets are at an angle in the range of 35 to 48. and the preferred azimuth edge of the upper crown-2 facets are 6.59, 28.89, 41.55, 52.49, 63.19, 116.79, 127.49, 138.43, 151.00, 173.39, 207.59, 244.90, 267.99, 271.99, 294.99, 332.39 respectively, Upper Crown 2 facets are optional. Upper Crown 2 facets add more brightness to the stone. The Main crown facets comprise of a pair of substantially triangular crown curve facet (G) at an angle of 30 to 38 at an azimuth edge of 25 & 155.0; a pair of four sided crown head-1 facet (G) and a pair of four sided crown head-2 facet (G) at an angle of 32 to 40 at an azimuth edge of 233, 256, 284, 307; a pair of four sided crown wing facet (G) at an angle of 33 to 40 and at a preferred azimuth edge of 47 & 133, and one kite shaped crown point facet (G) at an angle of 30 to 42 in relation to the central table at 15 to 30. in relation to the central table (J) at an azimuth edge of 36.45, 61.78, 118.20, 143.54, 192.85, 256.33, 283.65, 347.13. No claim is being made in respect of the crown angles or the crown table.

[0038] As seen in FIG. 3 and FIG. 10, the plurality of pavilion facets, which lye below the girdle facets (K), comprise of even number of lower girdle facets (L) and short half facets (T), and half the number of pavilion main facets (O). In a normal round cut or heart shaped gemstone, substantially triangular and even number of lower girdle facets (L) with girdle facet angles (X) in the range of 30 to 65 at girdle depths ranging from 65% to 85%, which extend downwards from the girdle having vertices towards the culet (D), are first cut and polished at heights and azimuth in the manner known in the art. In a primary embodiment of this invention, the lower girdle facets are cut and chiselled at azimuths such that kite shaped pavilion main facets (O) emerge upwardly of the culet. The short arms (P) of the kite shaped pavilion main facets converge at the culet and the long arms (Q) converge at 1.sup.st points (R) which are approximately at a girdle depth of 70% to 85%. The long arm and short arm of each of the kite shaped pavilion main facets meet at 2.sup.nd point(S) which are approximately at a girdle depth of 80 to 96%. Once the pavilion main facets are chiselled, the vertices of the lower girdle facets come to be at the girdle depth of the 2.sup.nd point (S). The facets are cut and polished in the aforesaid order and arranged on either side of an axis plane traversing the pavilion along a horizontal plane. As seen at FIGS. 4 and 11, each pavilion facet has a corresponding symmetrical pavilion facet across the axis line, and the pavilion facets have one vertex pointing towards the culet. For the purpose of this embodiment a pair of symmetrical pavilion main facets (O.sub.3,O.sub.6) are cut from two pairs of lower girdle facets which do not have any common side along the axis line, and chiselled to have the 1.sup.st point (R) of such pavilion main facet to be 0.5% to 10% less than the other pavilion main facets, thus making this pair the longest pavilion main facet. A pair of substantially triangular pavilion short half facets (T.sub.8, T.sub.9) are cut and chiselled from a pair of lower girdle facets having a common side along the axis line (C), at 1.sup.st pavilion short half angles along a cable R joining the 1.sup.st points of the pavilion facets (O.sub.4,O.sub.5) nesting such short half facets. From a point (V) where the axis line emerges to the pavilion surface, at a girdle depth equal to the girdle depth of the longest pavilion main facet with a variance of not more than 15%, the gemstone is cut, chiselled and polished along a cable (R) at 1.sup.st pavilion angles to connect the 1.sup.st point of the pavilion main facets (O.sub.1,O.sub.8) adjacent to such pavilion short half facets (T.sub.1, T.sub.16). Subsequently substantially triangular short half facets (T) are faceted out from the remainder lower girdle facets, at 1.sup.st pavilion short half angles, along the cable (R) connecting the 1.sup.st points of the remainder pavilion main facets, such that the lower girdle facets and corresponding short half facets have a common vertex at corresponding 2.sup.nd points(S). In an optional embodiment of this invention, prior to cutting any pair of pavilion short half facets, a pair of small pavilion short half facets (T.sub.8, T.sub.9) are cut and chiselled from the culet end side of a pair of lower girdle facets having a common side along the axis line, at 1.sup.st pavilion short half angles, along a cable (R). The cable (R) connects the 1.sup.st points of pavilion main facets (O.sub.4,O.sub.5) adjacent to such small pavilion short half facets (T.sub.8, T.sub.9), such that the cable traverses through a point (V) on the axis line at the azimuth of approximately 160 to 220,at a girdle depth midway between the 1.sup.st point and 2.sup.nd point of the pavilion main facets (O.sub.4,O.sub.5) nesting such pair of small pavilion short half facets (T.sub.8,T.sub.9). This creates the indent to give a perfect notch and apex of the heart (AD) when the gemstone is seen from the pavilion view or the table view.

[0039] In a pavilion view, (FIGS. 3,4, 10,11) pairs of short half facets alternate the long arms of the pavilion main facets. The 1.sup.st pavilion short half angles (W) are at least 0.05 to 8 less than the girdle facet angle (X). The pavilion main facets are further cut, chiselled and polished at a depth of the 2.sup.nd points (S) at 2.sup.nd pavilion short half angles along a 2.sup.nd cable joining the 2.sup.nd points of the pavilion main facets. The 2.sup.nd pavilion short half angles are 0.25 to 5 less than the 1.sup.st pavilion short half angles. This also results in the girdle depth of the culet being altered to a girdle depth less than the original gemstone. The pavilion main facets, short half facets, 1.sup.st pavilion short angles and 2.sup.nd pavilion short angles are cut, chiselled and polished at predetermined heights, facet angles, and azimuth to enable the invention.

[0040] In another embodiment of this invention, the gemstone has in addition to the table facet as described above, 12 to 24 lower girdle facets, 12 to 24 short half facets and 4 to 12 pavilion main facets.

[0041] The preferred facet azimuths for the girdle facets, 1.sup.st pavilion short half angle and 2.sup.nd pavilion short half angle for a round cut diamond, for an improved embodiment having 16 lower girdle facets, 16 short half facets and 8 pavilion main facets, with the 1st point of the pair of pavilion main facets (O.sub.3,O.sub.6) having the shortest girdle depth immediately adjacent to the pavilion mains (O.sub.4,O.sub.5) nestling the small pavilion short half facets. is given in Table II below:

TABLE-US-00002 TABLE II Difference from Its Name Number Ideal of Facets of Range(Plus Ideal Facets facet involved facets or Minus) Azimuth (Respectively) Lower M1 To 8 0-15 11.25; 33.75; 56.25; 78.75; Girdle M16 101.25; 123.75 Facets 146.25; 168.75; 191.25; 213.75; 236.25; 258.75; 281.25; 303.75; 326.25; 348.75 l.sup.st Pavilion T1 To 16 0-15 211.08; 33.65; 56.31; (Short) T16 78.88; Halves 101.32; 123.75 Angle 146.04; 168.95; 192.04; (Facets) 213.95; 236.24; 258.67; 281.11; 303.68; 326.34; 348.91 Pavilion O1 TO 8 0-5 20.36; 68.74; 111.68; Mains O8 158.71; 201.28; 248.31; Angle 291.25; 339.63

[0042] The preferred facet azimuths for the girdle facets, 1.sup.st pavilion short half angle and 2.sup.nd pavilion short half angle for an improved embodiment having 16 lower girdle facets, 16 short half facets and 8 pavilion main facets, with the 1st point of the pair of pavilion main facets (O.sub.3,O.sub.6) having the shortest girdle depth immediately adjacent to the pavilion mains (O.sub.4,O.sub.5) nestling the small pavilion short half facets. for a heart shape diamond is given in Table III below

TABLE-US-00003 TABLE III Difference from Its Name Number Ideal of Facets of Range(Plus Ideal Facets facet involved facets or Minus) Azimuth (Respectively) Lower L1 To 16 0-15 8.79, 31.79, 40.29, 51.79, Girdle L16 63.39, 116.59, 128.19, Facets 139.69, 148.19, 171.19, 209.29, 245.89, 257.09, 282.89, 294.09, 330.69 l.sup.st Pavilion T1 To 16 0-15 8.57, 31.17, 39.39, (Short) T16 52.14, 64.26, 115.73, Halves Angle 127.84, 140.6, 148.810, (Facets) 171.41, 209.69, 246.05, 252.07, 287.92, 293.94, 330.1 Pavilion O1 TO 8 0-5 350.2935.35, 57.54, Mains O8 122.47, 144.66, 189.73, Angle 249.52, 290.5

[0043] The facet azimuths mentioned in the table are indicative of the preferred azimuth, and could vary in the range of +/15.

[0044] As seen in FIGS. (4) and (11), the pavilion facets (L, T, O) are symmetrical with the corresponding pavilion facets on the other side of the axis line (C).

[0045] In round cut gemstone, there is a consistency in the girdle angles, 1st pavilion short half angles and 2nd pavilion short half angles, subject to minor variations in the range of +/1. In respect of heart shaped gemstones, the facets are further cut, chiselled and polished such that there is a variation in the girdle facet angles of adjacent lower girdle facets in the range of 0 to 2. Likewise there is a variation in the 1.sup.st pavilion short half facet angles of adjacent short half facets in the range of 0 to 3.5, and in 2.sup.nd pavilion short half facet angles in the range of 0 to 3. This addresses the asymmetry in a heart shaped gemstone, to enable the making of a gemstone encompassing a heart shape within. Table IV below gives the angle range of the girdle facet angle, 1st pavilion short half angle and 2nd pavilion short half angle, which would enable a heart shaped design to be produced within the gemstone.

TABLE-US-00004 TABLE IV IDEAL IDEAL IDEAL ANGLE Name No. OF FACET ANGLE ANGLE For range For OF Angle FACETS NO. RANGE round cut Heart shape Girdle facet 8-24 16 30-60 43.0 39.90 to angle 46.30 1.sup.st pavilion 8-24 16 30-60 39.5 37.53 to short half 44.54 angle 2.sup.nd pavilion 4-12 8 25-45 36.0 38 to 41.60 short half angle Difference in *** 0.01- 3.0 +0.46 to girdle facet 8.0 +3.90 angle & 1.sup.st pavilion short half angle Difference in ** * 4.00 1.0 3.30 To 1.sup.st pavilion to 8 +0.47 short half angle and 2.sup.nd pavilion short half angle

[0046] Table V below gives the percentage depth at which the lower girdle facets, short half facets and pavilion main facets, the 1.sup.st pavilion short half angle and the 2.sup.nd pavilion short lower half angle with reference to the girdle are cut, where girdle is considered as 0 and culet as 100.

TABLE-US-00005 Short Names of Number Ideal Girdle Range of Name of facet Facets of facet Depth Girdle Depth Lower (Halves) Girdle M1 To 16 65 to 85 78 to 82 Facets (Pavilion Lower M16 Halves Facets) 1.sup.ST Pavilion(Short) Halves T1 To 16 70 to 85 82 to 85 Angle (Facets) T16 2.sup.nd Pavilion Angle O1 To 8 80 to 96 88.5 to 96 O8

[0047] In a more precise embodiment of the invention, the gemstone has 16 lower girdle facets, 16 short half facets and 8 pavilion main facets and the facet depth at the 1.sup.st point ranges from 82-85%, and the facet depth at the 2.sup.nd point ranges from 88.5 to 96%, with angles of variance among the facets as mentioned above.

[0048] FIG. 6a and FIG. 14 depict representations showing girdle depth at which desired results of a perfect heart shape is achieved in a round cut gemstone and heart shape gemstone respectively.

[0049] This invention could be applied to any gemstone where the hardness is over 5, but it is best applied in a diamond, where because of the brightness, lustre and fire, as a result of the cuts on the table facet, the heart shape is perfectly seen inside the diamond, giving the effect of one diamond being inset in another diamond.