Black Spinel 6mm Round - 15-16 Inch birthstone_sapphire Ruby was valued more highly

Ruby was valued more highly than any other gem

Thulite is the naturally occurring pink variety of the mineral Zoisite

First described in 1881

It is found only in a four square mile area in a remote mountain range of Chihuahua

sapphires get their various colors from trace elements

Black Spinel 6mm Round - 15-16 Inch birthstone_sapphire Ruby was valued more highlySpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.