Art Deco 2.02 Sapphire and Diamond Engagement Ring in PlatinumArt Deco 2. 02 Sapphire and Diamond Engagement Ring in Platinum. This Art Deco engagement ring features a 2. 02 carat blue sapphire and 1. 08 carats of diamonds finished in shimmering platinum. The blue sapphire showcases a highly saturated, dark blue hue. The primary sapphire is cushion cut, featuring large facets and rounded corners that honor the generous size of the stone. The center stone is bezel set and flanked by two (2) . 20 carat diamonds. A