The present invention is a novel technique for setting a multiplicity of diamonds such as diamonds into a unique setting to enhance the beauty and presentation, with the technique including steps of assorting, blocking, mapping, sawing, polishing, assembling and grooving of assembling of white, naturally colored and treated color natural diamonds. The present invention provides method where each diamonds is separately processed for ultimate brilliance and cumulative refraction. The flat surfaces of the adjacent diamond are joined to form the complete design in the system. The assembled diamonds are arranged by grooving and providing support to form final pattern of the jewelry. The present process is advantageous with regards to usage of maximum utilization of raw diamond and process that gives great brilliance of large diamond and expensive appearance to user.

A gemstone with a chaton cut has tapering facets of a crown adjoin a flat table all the way round inclined relative to the table. The facets extend as far as a rondist at which the gemstone has the largest transverse dimension. A pavilion of facets, preferably terminating at a point, adjoins below the rondist. The gemstone is at least partially made of glass, and the crown angle () is between 40.5 and 42.5.

An oval shaped diamond, adapted to display a hearts and arrows pattern when exposed to light characteristic of the hearts and arrows pattern in a round diamond, comprising: an oval shape having two long sides symmetrical to each other, two short sides symmetrical to each other and four diagonal sides symmetrically located between the long sides and the short sides respectively, eight main crown facets, eight main pavilion facets, sixteen pavilion half facets; a uniform girdle of varying thickness separating the crown and pavilion facets, twelve subsidiary pavilion facets and eight crown star facets with each crown star facet including two facet sections of equal size and geometry on each of the two long and two short sides of the oval shaped diamond and two facet sections of non-equal size and geometry in each of the four diagonal or shoulder sides of the oval shaped diamond.

Presented 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 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 a 1% deviation from the center of the girdle.

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.

Methods, apparatus, and systems for managing optical characteristics of gemstones with diffractive structures are provided. In one aspect, a method includes obtaining a three-dimensional model of a gemstone including representations of surfaces of the gemstone, identifying a region on a surface of the gemstone having an optical value higher than one or more other regions on the surface of the gemstone by analyzing the three-dimensional model of the gemstone, and determining a diffractive structure to be arranged on the identified region of the surface of the gemstone, such that the gemstone with the diffractive structure has a higher optical performance than the gemstone without the diffractive structure. The method can also include fabricating the determined diffractive structure on the identified region of the surface of the gemstone.

A non-ablative laser machining method and apparatus for cutting facets of a diamond, using a material machining technique involving filamentation by burst ultrafast laser pulses well suited to mass production. Coupled with 3D modeling and the computerized laser machining system, complex geometric surfaces can be created on the diamond. The facets of the diamond need not be planar in configuration, and may incorporate acute as well as oblique angles. This method minimizes the need for diamond polishing, speeds up production, and realizes great reductions in the quantity of lost material from the cutting process.

A gemstone has a chaton cut, in which a crown adjoins a flat table and has facets that are inclined downwardly relative to the table all the way round, wherein the crown has main facets that extend substantially from the table as far as a girdle at which the gemstone has the largest transverse dimension. A pavilion of facets, preferably facets converging to a point, adjoins below the girdle. The gemstone consists preferably entirely of topaz, and the angle of the main facets relative to a cross-sectional face arranged parallel to the table is between 32.5 and 34.5.

A method for producing a gemstone, in particular a diamond, in the shape of a star with several arms, the method including taking a basic, brilliant cut gemstone, the gemstone including a basic crown, a basic pavilion and a basic girdle joining the basic crown and the basic pavilion and defining a plane, cutting a plurality of facets in the respectively basic crown, pavilion and girdle, to obtain a transformed gemstone delimited by a periphery, laser cutting the periphery of the transformed gemstone to produce the star shape.

A decorative element comprising a faceted transparent body having a front surface and a back surface, and a coating on at least part of the back surface of the faceted transparent body. The coating comprises a reflective layer of semiconductor material and a layer of lacquer over the reflective layer, and the reflective layer of semiconductor material has a thickness of at least about 400 nm or at least about 250 nm. Methods of making a decorative element, uses of the decorative element, a switch cover comprising the decorative element, and a switch comprising a sensor for detecting actuation of the switch and a cover protecting the sensor and comprising the decorative element are also described.