Black Spinel 4mm Faceted Coin - 15-16 Inch Specimens Like all other natural turquoise

Like all other natural turquoise

midnight blue glass with flecks of copper suspended within it

a banded Chalcedony that is predominantly white with layers of brown

Moonstone is a Feldspar mineral that was used in Roman jewelry nearly 2

making it ideal for determining the size

Black Spinel 4mm Faceted Coin - 15-16 Inch Specimens Like all other natural turquoiseSpinel 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.