The luster of gems has the following types:
① Diamond luster refers to the luster produced by gems with high refractive index. Generally refers to the gloss shown by diamonds. Close to (or slightly inferior) diamond luster is called sub-diamond luster, such gems include zircon, garnet and so on.
②Glass luster refers to the luster produced by gems with medium refractive index and most transparency. It is further divided into strong glass luster gems, such as golden emeralds; glass luster gems, such as emeralds and spinels; sub-glass luster gems, such as opal and fluorite.
③Resin luster and grease luster refer to the luster produced by soft and low-refractive gemstones, such as amber.
④ Waxy luster refers to a luster similar to resin grease, but with a more irregular surface. Such as turquoise and rough chalcedony.
⑤Metallic luster refers to a very strong luster produced by the surface of some simple metals and a few gems. Such as gold in precious metals and very typical hematite, pyrite and marcasite.
⑥ Silk luster refers to the luster shown by some gems with fiber structure. Such as plaster, malachite, tiger’s eye.
⑦Pearl luster refers to the halo that appears because pearls have a concentric structure in which two substances are arranged alternately and interfere with light, which is called pearl luster. Generally refers to the luster shown by pearls, and there are also gems with similar pearl luster, such as moonstones with rough surfaces.
Selain itu, there are rare pitch glosses, such as coal jade.
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