The 10.04 carat triangular-shaped chrome tourmaline is a truly notable example of this rare variety. Unlike the vast majority of common green tourmaline colored predominantly by iron, chrome tourmalines possess the more exotic chromium and vanadium. These ingredients are responsible for some of the most amazing gem colors known, including giving rubies their red and emeralds their green. Chrome tourmalines of fine quality over 2.00 to 3.00 carats are notable and a stone over 5.00 carats is quite rare. This example, weighing just over 10.00 carats, is the finest example Dr. Arem ever encountered. Its lovely shape takes best advantage of the natural crystalline form of tourmaline. He was shown the stone in Nairobi in October of 1980, fresh from its discovery in Tanzania which has produced the finest known chrome tourmaline to date. The quality and size were notable enough that Dr. Arem included this stone as a prime example, illustrating it in his revered publication “Color Encyclopedia of Gemstones”, a noted reference for countless gemologists and gem enthusiasts.