1.10 Cts of 4.5 mm AA Princess Created Ruby Stud Earrings in Sterling Silver Great anniversary or birthday gift. The studs have a fine AA quality princess-cut Created Ruby each prong set in Sterling Silver. Sterling Silver is 92.5% pure silver and 7.5% alloy. It is stronger than pure silver. 30 Day No questions asked Return Policy Free-Shipping within US July Birthstone/Anniversary/Birthday Gift