Endless Cheer Moissanite Stud EarringsNo certificate of authenticity and limited warranty card with gemological research association (gra), because a single moissanite has fewer carats (less than 0. 3 carats). Picture style: Flat lay Features: Moissanite, each earring has 0. 2 ct moissanite, the total is 0. 4 ct Material: 925 sterling silver, moissanite, rhodium plated Care: Avoid wearing during exercise, as sweat will react with the jewelry to produce silver chloride and copper sulfide.