1.08 Art Deco Old European Diamond Engagement Ring in Platinum.  This Art Deco engagement ring features a 1.08 carat Old European cut diamond in platinum. The primary natural diamond has a faint champagne hue with vintage OEC facets that glitter in the light. Set with four bold platinum prongs, the diamond rests in an architectural basket mounting. The band is slightly tapered with beautiful engravings that decorate the shoulders. This antique engagement ring is currently a size 8.5 but can be resized upon request.