5.20 Vintage Green Sapphire Engagement Ring PlatinumThis Art Deco engagement ring features a GIA certified 5. 20 carat round cut green sapphire and diamond accents in platinum. The center sapphire displays a greenish blue hue and is completely natural with no heat treatment. Set in a four prong basket, the primary sapphire is accented by six (6) single cut diamonds totaling . 15 carats that sparkle at the shoulders. The colorless accent diamonds bring brilliance to the vibrant color of the sapphire.