1.67 Vintage Art Deco Diamond Engagement Ring in Platinum.  This Art Deco engagement ring features a 1.67 carat Old European cut diamond set in platinum. The design of this mounting is very angular and geometric, with sharp corners boxing in the center diamond and rectangular milgrain borders around the baguette accent diamonds. There are slight open spaces on the shoulders around the lowest baguettes which adds a finishing touch to this elegant vintage ring.