Black Spinel 5mm Round - 15-16 Inch 8-Inch Strands With the possible exception of

With the possible exception of the horizon meeting the bright blue sky on a perfect summer day

but its identity is complicated

It is a variety of banded Chalcedony with layers that may contain scarlet

It is highly regarded for its beautiful blue color flecked with gold inclusions of pyrite

Lava is rock from the molten center of the earth

Black Spinel 5mm Round - 15-16 Inch 8-Inch Strands With the possible exception ofSpinel 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.