Sterling Silver Gemstone Earrings 30 Day Easy Returns. Jewelry Gift Box Included .925 Sterling Silver Natural Sapphire stones are heat treated to remove color zoning, and improve color and vibrancy. No radiation, chemicals or health risks are involved in this process. This process is permanent. 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.