Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm including Moonstone

including Moonstone

gray and purple

though treated stones have more potassium in them than before

originally from the Lapis-Lazuli mine in Afghanistan

Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm including MoonstoneSpinel 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.