SPHENE.

Sphene, also known as titanite, is a rare gemstone. It is prized for its stunning brilliance, high dispersion, and diamond-like luster. The name "sphene" comes from the Greek word meaning "wedge", which alludes to the formation of its crystals. The color of sphene can range from yellow to red, brown, brownish, or yellowish green to green, and black