Vintage Estate 1.38 CTW Sapphire Diamond Halo Platinum Engagement Cocktail Ring, Size 5.75This vintage platinum sapphire diamond halo ring is simply classic and elegant! The center stone is a 1. 18 ct (approx. 6. 95mmx5. 1mm) superior quality cushion cut natural blue sapphire. The sapphire has a lovely medium velvet blue color. Very pleasing to the eye. The sapphire is surrounded by 0. 20 ctw small prong set round cut diamonds forming a gorgeous halo design. If you are looking for high quality sapphire as your engagement ring or sapphire