Thai black spinel ranks eight on the Mohs scale of hardness, meaning it is suitably scratch-resistant and durable. Dark and opaque, Thai black spinel is an excellent choice for anyone wishing to own a black gemstone. When polished, the gem possesses a vitreous luster, similar to the sparkle and shine of cut glass. Look your stylish best all day with this ring. Decked with a lustrous oval of Thai black spinel, the piece is detailed with miligrain work. Fashioned in sterling silver. Natural properties of mined gemstones offer a slight difference in color saturation, hue, and tone. Gemstone images may not always capture these slight differences.