Aquamarine Stud Earrings Set in Sterling Silver (4mm 1/2ct tgw) 4MM Round Aquamarine 1/2ct tw. Sterling Silver Backs and Posts Rhodium Finished March Birthstone All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. 4MM Round Aquamarine 1/2ct tw. Sterling Silver Backs and Posts Rhodium Finished March Birthstone