This is an authentic VAN CLEEF & ARPELS 18K Yellow Gold Diamond Blue Agate Reversible Guilloche Vintage Alhambra Ring 53 6.5. This ring is crafted of 18 karat rose gold and features a reversible vintage alhambra motif with blue agate inlay on one side and on the other side a guilloche texture with a single diamond weighing approximately .04 carat. Follow this item for alerts. Van Cleef & Arpels is a registered trademark of Van Cleef & Arpels. FASHIONPHILE is not affiliated with Van Cleef & Arpels.