Lady's Platinum Sapphire and Diamond Ring. Ring Size: 6 1/2(Can be Resized to Fit Most Any Finger) Contains: 1 Pear Shaped Natural Sapphire. Weight: 3.70ct, Color: Blue, Clarity: Transparent. 30 Brilliant Round Cut and 6 Fancy Cut Natural Diamonds. Weight: 0.60cttw, Color: G-H, Clarity: VS1/VS2. The property of a grand Japanese lady. Here at the gallery, we've gone through many sapphires over the years. This regal ring is very reminiscent of the one that Lady Di wore as an engagement ring. Three carat sapphires are few and far between.