Cushion Cut Sapphire & Diamond Engagement Ring in PlatinumCushion Cut Sapphire Diamond Engagement Ring in Platinum. This fabulous ring features a 3. 31 carat cushion cut sapphire and 1. 5 carats of round brilliant accent diamonds set in platinum. The sapphire is set with double prongs in its four corners and wrapped with a dazzling diamond halo. The open basket is adorned with diamonds and allows plenty of light into the sapphire, flooding the undercarriage with a beautiful blue glow. This is a stunning