Black Spinel 8mm Faceted Round - 15-16 Inch R1738 Selenite is a crystal formed

Selenite is a crystal formed from the mineral gypsum

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

It's defined by a bright green color

Botswana Agate was formed nearly 187 million years ago by lava flowing in waves from long faults in the earth

the third to hardest common natural gemstone

Black Spinel 8mm Faceted Round - 15-16 Inch R1738 Selenite is a crystal formedSpinel 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.