is a magnificent stone; unfortunately has a name that has been confused with Cubic Zirconia, which is a synthetic material. In the middle age the reddish-brown variety has been named Hyacinth, today in some countries this name is applied only to the yellow type. Good hardness (7.5- 8 from the Mohs scale),but is little brittle.From Tanzania.
Size: 8x5.8x3.5 mm.
Weigh: 1.68 ct.