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What is moissanite stone? ‌Moissanite‌, whose full name is Synthetic Moissanite (synthetic silicon carbide), is a synthetic gemstone whose chemical composition is silicon carbide (SiC), with a Mohs hardness of 9.25 and a specific gravity of 3.22. Moissanite has a refractive index of 2.648-2.691, a birefringence of 0.043, and a dispersion of 0.140. These characteristics allow it to show brilliant fire and rich color changes under light. ‌ What are the advantages of the Belgium cut? What is GRA certificate and GRA waist code? GRA is a certificate used to identify moissanite diamonds. When purchasing moissanite jewelry, consumers can ensure the quality and authenticity of the jewelry they purchase by checking the appraisal certificate from authoritative organizations such as GRA. Each stone has a unique waist code and corresponding certificate.