Hallmark: 750 All signature ruby and R. Coin in the interior surface. This fabulous band width is 12 mm. Return must be made within 3 days from the day you receive your item.Return item must be in the original condition as received. The item "ROBERTO COIN 18K DIAMOND & BLACK SAPPHIRE FANTASIA BAND RING" is in sale since Friday, May 18, 2018. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Diamond". The seller is "hopsf2018" and is located in San Francisco, California. This item can be shipped to United States.