7.18 Blue Sapphire Cushion Cut And Diamond Three Stone Ring. The natural Sapphire center stone is flanked by two half moon diamonds weighing .69 carats total weight, and an additional 1.42 carats of diamonds surround the large center stone and down the sides of the ring. Prong and Pavé set ion 18 karat white gold. Size 6 but can be sized free of charge. We source each of the stones and then work with artisans all over the world to achieve our designs. This ring was made for us in Los Angles, California. 9.29 carats total weight.