Item #: 30553 This is an authentic TIFFANY & CO Platinum Half Circle 3mm Diamond Celebration Ring 6.5. This stunning ring is platinum and half of it is centered with 3 mm diamonds. This is a fabulous piece with an elegant look, from Tiffany & Co. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.