NATURAL 2.50CT. ROYAL BLUE ROUND CUT SAPPHIRE WITH WHITE TOPAZ RING SIZE 7 SET IN STERLING SILVER 925. FACE OF RING SETS 1/4 INCH HIGH FROM FINGER. RING WEIGHS 3.4 GRAMS AND THE STAMP IS HARD TO SEE BUT IT IS THERE. THERE ARE 8 PRONGS FOR SECURE MOUNTING. THE WHITE ROUND CUT TOPAZ SPARKLES LIKE DIAMONDS.