Drama calls and this Black Spinel necklace answers. Black Spinel is actually rarer than black diamonds and unlike black diamonds, is naturally this deep black color. Black is the rarest of the colors that occur in spinel family and is usually mined alongside rubies and sapphires. 17 inch length Metal/Materials: . Black Spinel beads, beading cable, gold crimps, gold French wire, gold-filled lobster clasp, crimp covers and jump rings. (sterling silver lobster clasp option)