Lady's 18K White Gold Heart-Shaped Sapphire & Diamond Ring. Ring Size: 7 1/2 (Can be Resized to Fit Most Any Finger.) Contains: One Natural Heart Shape Sapphire. Weight Approx: 3.50ct, Color: Blue, Origin: Thailand. 196 Natural Round Brilliant Cut Diamonds. Weight Approx: 1.50cttw, Color: G-H, Clarity: VS / SI. This is a smashing natural sapphire & diamond ring highlighted by a heart-shape blue sapphire. It is mounted in a 18k white gold mounting containing 1.50 carats of diamonds that accent the sapphire. It is extremely hard to find a piece of rough that would produce such a unique heart-shape sapphire. They just do not come that way.