Black Spinel Gemstones Hardness 8.0. Appearance Black spinel is the opaque jet-black variety of spinel .
Black spinel is the premier black gemstone.
With a hardness of 8, it's extremely durable. Black spinel lacks the metallic lustre of hematite , another popular black gemstone. Black spinel would make an attractive center stone when surrounded by diamond s or white sapphire s. Enhancements Black spinel is not enhanced. More information on gemstone enhancements.