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.

An ornamental device includes: diamonds disposed on a single support element in a specific physical arrangement, all the diamonds in the specific physical arrangement having a blue fluorescent equal to or stronger than strong blue, wherein all the diamonds in the specific physical arrangement shining clear under a visible light, and shining blue under ultraviolet radiation keeping the specific physical arrangement distinguished from a group of diamonds in the specific physical arrangement, the group of diamonds comprising a mixture of a diamond or diamonds having a blue fluorescence equal to or stronger than strong blue and a diamonds or diamonds not having a blue fluorescent equal to or stronger than strong blue.

A method of re-identifying a rough gemstone comprises providing a 3D model of a first rough gemstone; generating a series of virtual 2D silhouette images of the 3D model; processing each 2D image of the series of virtual 2D silhouette images to obtain a dataset associated with the first rough gemstone; and comparing the dataset of the first rough gemstone with an existing dataset of a rough gemstone. Where the dataset of the first rough gemstone and the existing dataset match each other, the method comprises re-identifying the first rough gemstone as the same rough gemstone from which the existing dataset was obtained.

The invention relates to a gemstone arrangement, that comprises a first gemstone element, a second gemstone element, which is connected to the first gemstone element, and at least one decorative element, which is arranged between the first gemstone element and the second gemstone element. Furthermore, the invention relates to a method for producing the gemstone arrangement. A further aspect of the invention relates to a jewel with a gemstone arrangement.

Provided is a gemstone growing device including: a first pipe; a second pipe disposed below the first pipe and connected to the first pipe; a third pipe configured to surround the second pipe; a mixed material input part disposed in the first pipe; an oxygen input pipe connected to the first pipe; a first hydrogen input pipe connected to the third pipe; and a muffle disposed below the third pipe.

Different types of gallium nitride (GaN) gemstones can be produced synthetically for crafting jewelry. With some examples, a GaN gemstone can include a crystal (such as a single crystal that is typically used in semiconductor devices or other types of electronic components, e.g., electronic components with optical properties). The crystal of the gemstone can be grown to be relatively pure and translucent GaN as well as cut and polished to have facets of a gemstone. Also, the crystal can include doped GaN—such as GaN doped with indium or aluminum. The doping of the GaN can be to an extent to produce a visibly discernable color (such a tint of blue).

Methods, apparatus, and systems for fabricating diffractive structures on gemstones for high optical performance are provided. In one aspect, a method includes obtaining a plurality of gemstone characteristics of a gemstone, determining that the gemstone exhibits each of the plurality of gemstone characteristics within a respective predetermined range, identifying a diffractive structure setting associated with a combination of the respective predetermined ranges for the plurality of gemstone characteristics, and fabricating diffractive structures on the gemstone according to the diffractive structure setting.

The invention relates to a method of decorating a nail which comprises forming a socket in an operatively upper surface of the nail, preferably at a position forward of a free edge of the natural nail, with the socket being complimentary shaped and sized to a pavilion of a cut diamond to be secured in the socket; securing at least part of the pavilion of the diamond in the socket by means of an adhesive that is compatible with the nail and the diamond, covering the operatively upper surface of the artificial nail and the crown and any part of the diamond which may extend above the socket with a clear acrylic layer and a top base gel, curing the top base gel, and shaping and buffing the upper surface of the clear acrylic layer and the cured base gel layer.

A center-cast tool for casting a non-uniform object is provided. The center-cast tool has a body having a casting bay recessed into the top side of the body. A base forms the bottom of the casting bay. First and second apertures extend through the base and the bottom side. The second aperture intersects the first aperture in perpendicular orientation to the first aperture to form an aperture intersection. The aperture intersection forms four opposing right angles on the base at the center of the bay. The distance between adjacent right angles in the base is equal to the length of each side of the bezel of a jewelry article into which the finish machined irregular object will be set. In another embodiment, a first release hole extends through the base and the bottom side on a first side of the aperture intersection.

A final layer of a multi-layer of thin deposit and lacquer layers of a decorative faceted functional stone formed by 10 to 35% of nano/colloidal silica, optionally nano/colloidal alumina, 30 to 50% of encapsulated aluminium flakes in grain size of 15-80 μm, 2 to 10% of Fe3O4 in grain size of 3-50 μm, and 10 to 40% of polyisocyanate-hardened mixture of epoxy and polyether resin, and a method for increasing the opacity and hardness of a multi-layer of thin deposit and lacquer layers of a decorative faceted functional stone by applying this final layer.