Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm whose color often caused ancient

whose color often caused ancient jewelers to confuse it with Emerald

this unique and earthy Petrified Wood Agate slab specimen is perfect for gift giving or keep for yourself

gray and purple

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

Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm whose color often caused ancientSpinel 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.