Lady's Platinum 4.00ct Yellow Sapphire & Diamond Ring. Ring Size: 7 1/2 (Can be Resized to Fit Most Any Finger) Contains: One Natural Oval Cut Sapphire. Weight Approx: 4.00ct, Color: Yellow, Origin: Sri Lanka (Ceylon). Seventy Natural Round Brilliant Cut Diamonds. Weight Approx: .75cttw, Color: G-H, Clarity: VS-SI. This is a rare and fine natural yellow sapphire diamond ring. This ring is a real fooler. I will explain what I mean about that. Today, one of the hottest jewels on the market are natural fancy yellow colored diamonds. Sapphires and diamonds are a lot closer then you would expect. On the hardness scale sapphire is just a hair away from the hardness of a diamond. Sapphires can be cut the same as diamonds, and as such it is not impossible to mistake a yellow sapphire for a yellow diamond. The stone is mounted in a handmade estate style platinum mounting. The size of the ring should fit most fingers, if not we can size it to fit. And because it came to us from a private estate at a reasonable price, we will sell it for $2,990.