15 Terms
Contributors in Gemstones
Gemstones
diffusion treatment
Fashion; General jewelry
form of heat treatment that adds one or more chemicals to the heating process to change the color of a gemstone. Typically the treatment does not penetrate deep into the stone, so gems treated in ...
dispersion
Fashion; General jewelry
he property of a transparent stone to split light into the seven spectral colors, causing the "fire" which is refracted by the internal facets. Diamond has a very high dispersion, hence its high ...
double refraction
Fashion; General jewelry
The ability of most gems to split rays of light into two rays.
doublet
Fashion; General jewelry
doublet is a gemstone composed of valuable gemstone material in combination with other materials. It is found most often in opal, where an opal doublet contains a slice of opal glued to common opal, ...
eye clean
Fashion; General jewelry
efers to a gemstone that appears to have no visible inclusions or imperfections to the naked eye. Compare Loupe Clean.
facet
Fashion; General jewelry
he cut and polished flat plane of a gemstone. There can be dozens of facets on a stone.
fancy cut
Fashion; General jewelry
ometimes used to refer to a gemstone cut in any shape other than the standard round cut, but also used to refer to gemstones that are cut in a shape other than the well known shapes of round, oval, ...
