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[2] [3] [4] Many stones like star sapphires and moonstones must be cut this way in order to properly display their unusual appearance. [1] [4] A faceted shape resembles that of the modern diamond. It has a flat, polished surface, typically with a transparent surface that refracts light inside the gemstone and reflects light on the outside. [5]
A prong setting is one component of what is known to jewelers as a head, a claw-shaped type of binding (typically three, four, or six individual prongs per head) that is welded or soldered to a jewelry item to mount (or "set") a gemstone to the jewelry item. [1] [2] A common setting for diamond engagement rings, the prong setting allows light ...
The prong setting consists of four or six 'claws' that cradle the diamond, allowing the maximum amount of light to enter from all angles, allowing the diamonds to appear larger and more brilliant. In bezel settings the diamond or gemstone is completely surrounded by a rim of metal, which can be molded into any shape to accommodate the stone.
The most suitable setting for gem amethyst is a prong or a bezel setting. The channel method must be used with caution. [42] Amethyst has a good hardness, and handling it with proper care will prevent any damage to the stone. Amethyst is sensitive to strong heat and may lose or change its colour when exposed to prolonged heat or light.
Less significant inclusions are ignored for the purposes of setting the grade; however, they may still be plotted onto a diamond plot chart. [2] Accurate clarity grading as with other grading steps must be done with the diamond "loose", i.e. not set into any mounting.
Refractive index readings of faceted gems can range around α = 1.651, β = 1.668, and γ = 1.689, with a biaxial positive birefringence of 0.037–0.038. With decreasing magnesium and increasing iron concentration, the specific gravity, color darkness and refractive indices increase, and the β index shifts toward the γ index.
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A 17th century English lapidary text. The etymological root of the word lapidary is the Latin word lapis, meaning "stone". [6] In the 14th century, the term evolved from lapidarius, meaning 'stonecutter' or 'working with stone', into the Old French word lapidaire, meaning 'one skilled in working with precious stones'.
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