Retro Geometric Engagement Ring in 14K Yellow Gold and PlatinumRetro Geometric Engagement Ring in 14K Yellow Gold and Platinum. This antique late Art Deco two tone engagement ring has great presence. The center old European cut . 28 carat diamond is bead set in platinum with a decorative square bezel. The ret of the ring is constructed in 14 karat yellow gold with excellent condition filigree wire work with a notable leaf design visible from the gallery (side) view.