14K Yellow Gold 3-Prong Martini-style Screw Back Stud Earrings are set in solid 925 Sterling Silver with non-tarnishing 18K White Gold plating for high polished shine and brilliance. Each stone is 6.5mm diameter, or 1/5-Carat diamond size. Each pair of earrings come with a GRA Lab Certification papers and Warranty card for total Authenticity. Your earrings come with a deluxe jewelry presentation gift box. Moissanite is rarer than diamonds but now grown in the lab to give you a clarity, color, look, and fire that is hard to find in real diamonds but at a substantial savings. Moissanite will pass as a diamond on a standard tester pen electronic device. Diamond has extremely high heat conductivity which means heat passes through the stone quickly. Moissanite has virtually the same heat conductivity that's why it will show up as diamond on a pen tester. Moissanite will never become cloudy, discolor or change its appearance. Moissanite will maintain its brilliance, color and clarity for a lifetime and beyond.