Each moissanite jewelry above 0.3 carat is accompanied by a Certificate of Authenticity and a Limited Warranty Card with Gemological Research Association (GRA). Picture style: Ghost mannequin Features: Moissanite Material: 925 sterling silver, moissanite Care: Avoid wearing during exercise, as sweat will react with the jewelry to produce silver chloride and copper sulfide. Imported Product measurements: 4: Diameter: 0.6 in (1.51 cm)5: Diameter: 0.6 in (1.62 cm)6: Diameter: 0.7 in (1.68 cm)7: Dia