.51 Princess Cut Diamond & Sapphire Ring in Platinum. This geometric sapphire and diamond engagement ring features .525 carats of diamonds and accent blue sapphires finished in platinum.  The center stone is a .51 carat princess cut diamond. The diamond has a light warm hue and is set in a square bezel. The sparkling center diamond is wreathed by sixteen (16) .058 carat French cut sapphires. For added brilliance, six (6) .0025 carat Round Brilliant accent diamonds line the shoulders of the band.