This is an authentic VAN CLEEF & ARPELS 18K Rose Gold Diamond Carnelian Reversible Guilloche Vintage Alhambra Ring size 52 or 6. This ring is crafted of 18 karat rose gold and features a reversible vintage alhambra motif with carnelian inlay on one side and on the other side a guilloche texture with a single diamond weighing approximately .04 carat.