Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm though treated stones have more

though treated stones have more potassium in them than before

” Tourmaline is unusual in that it is both pyroelectric and piezoelectric

Occurring in sizes ranging from a grain of sand to the size of an apple

including Moonstone

Rhodonite belongs to the Pyroxenoid group of minerals

Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm though treated stones have moreSpinel 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.