A gemstone includes a crown, a pavilion, and a girdle disposed between the crown and the pavilion. The girdle has an octagon-shaped cross-section. The surface of the gemstone is generally divided into a number of groups of interlocking facets disposed at a variety of angles. The groups of facets comprising the surface of the crown generally include star facets, upper intermediate crown facets, lower intermediate crown facets, main crown facets, and upper girdle facets. The upper girdle facets generally abut an upper edge of the girdle. The groups of facets comprising the surface of the pavilion include culet-adjacent facets, candle facets, main pavilion facets, and lower girdle facets. The lower girdle facets generally abut a lower edge of the girdle.

A gemstone includes a crown, a pavilion, and a girdle disposed between the crown and the pavilion. The girdle has a pear-shaped cross-section with a rounded end a tapered end narrower than the rounded end. The surface of the gemstone is generally divided into a number of groups of interlocking facets disposed at a variety of angles. The groups of facets comprising the surface of the crown generally include star facets, upper intermediate crown facets, lower intermediate crown facets, main crown facets, and upper girdle facets. The upper girdle facets generally abut an upper edge of the girdle. The groups of facets comprising the surface of the pavilion include culet-adjacent facets, candle facets, main pavilion facets, and lower girdle facets. The lower girdle facets generally abut a lower edge of the girdle.

The invention relates to the field of jewelry, specifically to a diamond with eighty-one facets having a ten hearts and ten arrows inner structure and a cutting method thereof. The diamond comprises a table facet, ten main crown facets and ten main pavilion facets; a crown star facet is disposed at a junction of two adjacent main crown facets with the table facet; a crown small facet is disposed at a junction of two adjacent main crown facets with the crown star facet; a small sector is disposed at a junction of the main crown facet with the crown small facet; and two main pavilion facet auxiliary surfaces are disposed at a junction of two adjacent main pavilion facets. The cutting method comprises a division of a pavilion, a crown and a girdle, the pavilion cutting and the crown cutting. The shaped diamond has very good brilliance, fire and sparkle.

A gemstone is provided that has an improved brilliance, especially at the crown portion of the gemstone. The gemstone has a crown angle that is less than an ideal cut round diamond and, preferably the crown angle is less than 27 degrees. By reducing the crown angle of the gemstone, light entering one end of the crown portion may exit the opposite end of the gemstone. In addition, reducing the crown angle reduces the mass necessary for the gemstone. As a result, the gemstone has a width or diameter that corresponds to a larger mass gemstone that is cut according to conventional ideal proportions.

Disclosed is a gemstone (1), comprising: a crown region (20) having flat octagonal surface (30) at top; a pavilion region (40) having conical shape; a culet region (50) being provided at the tip of conical pavilion region; and a girdle region (10) being positioned between the crown region (20) and pavilion region (40), the girdle region (10) consists of upper girdle portion (11) connected to the crown region and lower girdle portion (12) connected to the pavilion region. The crown region (20) comprises: single table facet (30) having octagonal shape forming the top of crown region; sixteen kite facets (32) being positioned between the table facet and upper girdle portion, eight triangular shaped star facets (31) extending from the table facet to kite facets, sixteen upper girdle facets (33) being situated closest to the upper girdle portion. The the pavilion region (40) comprises: eight tiles facets (41) extending from the culet region (50), sixteen blade facets (43) being situated closets to the lower girdle portion (12), eight hexagonal shaped hexy facets (42) extending from tiles facets (41) to blade facets (43), eight spear facets (44) extending from hexy facets (42) to lower girdle portion (12). A gemstone cut is in such a way that it creates hearts and arrow loupe appearance in the gemstone which resembles to Lotus flower (Padma in Sanskit).

Provided is a gemstone treated with a cut expressing a reflected image pattern not recognized before, wherein the gemstone includes the crown 100 having the table 110 and plural bezel facets 130, and the pavilion 200 having the culet 210 and plural main facets 220; the girdle 300 is formed between the crown 100 and the pavilion 200; a direction of a horizontal component of an inclination direction of the bezel facet 130 from the table 110 to the girdle 300 is set to be different from a direction of a horizontal component of an inclination direction of the main facet 220 from the culet 210 to the girdle 300; and inclination angles of the bezel facet 130 and the main facet 220 are set so that a light that enters the table 110 is reflected by two of the main facets 220 and emitted from the bezel facet 130.

A square princess cut gemstone (100) comprises a crown (300) having thirteen facets (310, 321-324, 331-334, 345-348). The crown facets include a square table facet (310) forming the top of the crown's truncated pyramid shape. Four upper girdle facets (321-324) extend upward from girdle edges (231-234). Four table-surrounding facets (331-334) extend upward from the upper girdle facets (321-324) to the table facet (310). Four bezel facets (345-348) straddles at least one of the adjoining corners of the upper girdle facets (321-324) and the adjoining corners of the table-surrounding facets (331-334).

A gemstone includes a crown, a pavilion, and a girdle disposed between the crown and the pavilion. The surface of the gemstone is generally divided into a number of groups of interlocking facets disposed at a variety of angles. The groups of facets comprising the surface of the crown generally include star facets, upper main crown facets, upper intermediate crown facets, lower main crown facets, lower intermediate crown facets, and upper girdle facets. The upper girdle facets generally abut an upper edge of the girdle. The groups of facets comprising the surface of the pavilion include culet-adjacent facets, lower candle facets, lower main pavilion facets, upper candle facets, upper main pavilion facets, and lower girdle facets. The lower girdle facets generally abut a lower edge of the girdle.

A decorative structure (20) comprising a planar support (22) and a faceted microstructure (24) on at least one side of the planar support (22) is provided. The decorative structure (20) may further comprise an at least partially reflective layer (26) configured to at least partially reflect light that passes through the microstructure (24). The faceted microstructure (24) comprises a plurality of grooves (28) creating a pattern of facets (30) over the surface of the support (22), such that the microstructure (24) is capable of splitting incident light into spectral colours. In embodiments, the grooves (28) have a triangular or V-shaped profile. Methods of making a decorative structure(20) and articles incorporating the decorative structure (20) are also described.

Presented is a diamond comprising a table, a crown, a girdle, and pavilion, and a culet. The table is rectangular, having a length and a width. The table comprises a first side, adjacent to a second side, adjacent to a third side, and adjacent to a fourth side. The first side of the table is directly connected with a first facet of the girdle. The second side of the table is directly connected with a second facet of the girdle. The crown comprises a plurality of facets connecting the third side and the fourth side of the table to the girdle. The girdle comprises five facets, the five facets comprising the first facet and the second facet, a third facet, a fourth facet, and a radiant facet. The first facet, second facet, third facet, and fourth facet form three substantially 90 degree angles. The radiant facet connects the third facet and the fourth facet. The pavilion is connected to the girdle. The culet is positioned directly below a point having less than a 1% deviation from the center of the girdle.