Sterling Silver Amethyst Ring 30 Day Easy Returns. Jewelry Gift Box Included .925 Sterling Silver The Amethyst stones are Heat treated. You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it! All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.