Diamond – Natural, Faceted, Colorless, 1.57 ct

Gemologists also use the term "adamantine," or "diamond-like," to describe gems with mirror-like luster, which refers to how a gem's surface looks when it reflects light. A number of gems (of course, including diamonds) show adamantine luster. Princess-cut diamond solitaire ring, 1.57 cts, 6.53 x 6.46 x 4.70 mm. © Dan Stair Custom Gemstones. Used with permission.

Article: A Brief History of Diamonds

Credit: Dan Stair Custom Gemstones