Adamantine

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This Diamond Exhibits an Adamantine Luster. The Term Can Also Refer to a Diamond's Extreme Hardness. Photo Courtesy of Lang Antiques.

Adamantine is the term used to describe the luster exhibited by diamonds and gems with a Refractive Index of 1.9 - 2.5. The root word adamant derives from the Greek word adamastos which means untameable. Throughout history the word adamant has been used in reference to anything that was composed of a particularly hard material, diamond or otherwise.

Subadamantine luster is slightly less than that of a diamond. Example: Zircon

Zircon, While Highly Dispersive, has a Subadamantine Luster. Photo Courtesy of Lang Antiques.
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Lang Antiques
Lang Antiques