Moissanite has the chemical formula SiC, and is a rare mineral, discovered by the French chemist Henri Moissan in 1893. Market start to sell lab synthetic moissanite from 1998. It's lower price and beautiful look  with some optical properties exceeding those of diamond to obtain it make it a popular alternative to diamonds.
rn heating it gradually will cause it to change color starting at around 65 °C (150 °F)