Antique Art Deco Platinum Diamond & 7.63 Carat Natural Blue Star Sapphire Ring. The ring is in excellent estate condition and ready to wear. The 7.63 carat sapphire is blue - grey in color, completely natural untreated and unheated. It comes with AGL certification. The sapphire is surrounded by a halo of approximately 1 carat of transition cut diamonds that are Vs1 - Si1 clarity, G-H color. The piece is a beautiful example of authentic 1930's art deco jewelry. The ring is a size 6 and weighs 7.5 grams.