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The art of cutting a gem is an exacting procedure performed on a faceting machine.The ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as "fire", and brightly colored flashes of reflected light known as scintillation.
Generally, a prong setting is formed of a number of short, thin strips of metal, called prongs, which are arranged in a shape and size to hold the given stone, and are fixed at the base. Then a burr of the proper size is used to cut what is known as a "bearing", which is a notch that corresponds to the angles of the stone. The burr most often ...
The diamond cut planning stage is a complex process that requires the cutter to work with unique rough stones. Very often, the location of the inclusions in a rough stone will determine the type of shape to which a diamond may be cut. For economic reasons, most diamonds are cut to retain weight instead of maximizing brilliance. [2]
A cabochon (/ ˈ k æ b u ʃ ɒ n /; from Middle French caboche 'head') is a gemstone that has been shaped and polished, as opposed to faceted. The resulting form is usually a convex (rounded) obverse with a flat reverse. [1] Cabochon was the default method of preparing gemstones before gemstone cutting developed. [2]
These have been a popular shape since ancient time and is more durable than faceted gems. [34] Stones which are cut with a faceting machine by polishing small flat windows called facets at regular intervals at exact angles. [34] Stones which are opaque or semi-opaque such as opal, turquoise, variscite, etc. are commonly
In retrospect, diamond experts feel that it should have been cut to yield a single large diamond. Why it was not, remains a mystery. By contrast, the owners of the Cullinan Diamond cut that stone in such a way that the largest faceted diamond in the world came from it. The fate of the Excelsior kept it out of the Smithsonian or other historical ...
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