A gemstone includes a crown, a pavilion, and a girdle disposed between the crown and the pavilion. The girdle has an elliptical cross-section with a major axis and a minor axis. 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 present disclosure relates to the field of Chemical Vapor Deposition (CVD) diamonds and their processing after fabrication. In particular, the present disclosures provides a method for coring and slicing a CVD diamond product, wherein the CVD diamond product comprises a CVD diamond and graphitized material covering several side-faces of the diamond. The method is carried out by an apparatus that provides a laser beam coupled into a fluid jet. The method comprises, for the coring, cutting the product with the laser beam to remove the graphitized material from the side-faces of the diamond. Further, the method comprises, for the slicing, cutting off one or more slices from the diamond with the laser beam.

Disclosed herein are synthetic, or cultured diamonds which have at least one artificially embedded inclusion(s) incorporated within their crystal structure during the diamond's deposition or growth process. Disclosed are cultured diamonds having a substrate portion, artificially embedded inclusion(s) disposed on the substrate portion, and an encapsulating portion, formed on the artificially embedded inclusion(s). The substrate portion and the encapsulating portion are bonded together by covalent carbon to carbon bonds.

Disclosed herein are synthetic, or cultured diamonds which have at least one artificially embedded inclusion(s) incorporated within their crystal structure during the diamond's deposition or growth process. Disclosed are cultured diamonds having a substrate portion, artificially embedded inclusion(s) disposed on the substrate portion, and an encapsulating portion, formed on the artificially embedded inclusion(s). The substrate portion and the encapsulating portion are bonded together by covalent carbon to carbon bonds.

Presented herein is a diamond comprising a table, a crown, a girdle, a pavilion, and a culet. The table is rectangular, having a length and a width. The table includes 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 includes a plurality of facets connecting the third side and the fourth side of the table to the girdle. The pavilion is connected to the girdle. The culet is positioned directly below a point having a 1% deviation from the center of the girdle.

A decorative article (100) having an observed colour effect that is changeable depending on observer (200) viewing angle, the article comprising: a decorative element (110) comprising a front side (114) facing a forward direction and a back side (112) opposite the front side facing a rearward direction, wherein the back side comprises a back surface (113) having a first region (122) and a second region (124) surrounding the first region; a first coating (132) arranged on the first region of the back surface, the first coating causing a first colour effect (102); and a second coating (134) arranged on the second region of the back surface, the second coating causing a second colour effect (104) that differs from the first colour effect.

A method includes the selection of a jewelry blank having a chamber for receiving a gem. The chamber is partially filled with a first layer of UV resin. Cremation remains are placed within the first layer of resin or on the surface of the first layer of resin. Then, UV light is used to cure the first layer of resin. A second layer of resin partially fills the remaining void and is cured. Diamond dust may be added to the top surface of the cured second layer. A final layer of protective resin is added into the remaining space of the chamber and cured to create the finished jewelry piece.

An apparatus for automated polishing of an object with multiple facets includes a polishing wheel, a robotic arm, a sensor and a controller. The robotic arm positions the object in contact with the polishing wheel. The sensor senses a polishing related parameter during polishing of the object with the polishing wheel. The controller operates the robotic arm to rotate the object about an axis perpendicular to the polishing wheel, receives a sensing signal from said sensor at different orientations of said object during polishing and selects a polishing orientation from the different orientations based on said sensing signal.

The invention relates to a modular element (1) for making jewelry items, trinkets and the like, having a convex outer surface (11) and a through hole (14) arranged at the top of said outer surface (11), wherein a wire, chain or support for making said jewelry item, trinket and the like, can be inserted through said through hole (14), a main axis of symmetry (X) passing through the hole (14), comprising a concave inner surface (12) intended to at least partially accommodate the outer surface (11) of a second element (1) adjacent to the first one, characterized in that said outer surface (11) can be inscribed on a rotation surface whose generatrix is an arc of a conic section and whose axis of rotation coincides with said main axis of symmetry (X).

This invention also relates to a jewelry item (100).

A method of determining an optimal target gemstone to be obtained from a rough gemstone comprises obtaining a first series of 2D images of the rough gemstone; providing a 3D model of a target gemstone to be obtained from the rough gemstone; and generating a second series of 2D images of the target gemstone from the 3D model thereof. The method then comprises comparing the first and second series of 2D images to determine an optimal transformation to be applied to the 3D model of the target gemstone.