Oval Sapphire Diamond Engagement Ring in Platinum.  This fine engagement ring features a sparkling 3.07 carat oval cut sapphire that is flanked by .12 carats of round diamonds and finished in Platinum. The beautiful sapphire is set with four gleaming platinum prongs that create an icy look to the overall design. The classic design is completed with two small diamonds on the shoulders and a highly polished shank below them.