.43 Art Deco Diamond Engagement Ring in Platinum.  This structured Art Deco engagement ring features a GIA-certified .43 carat old European cut diamond and diamond accents in platinum. The center stone is set in an illusion mounting and features a bright white hue, complementing the cool-toned platinum metal. Six (6) near colorless diamonds are set on the angular and engraved shoulders of the band. Fine milgrain details line the head of the ring blending into a smooth and slender polished platinum band.