Multi Spinel 3mm Banded Faceted Round - 15 Inch 12x15-19x20mm or bright blue

or bright blue

5 Inches / 20x40mm / 2x3

a variety of Feldspar

is transparent quartz crystal with brilliant sparkle

Multi Spinel 3mm Banded Faceted Round - 15 Inch 12x15-19x20mm or bright blueSpinel 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.