Antique Art Deco Solitaire Engagement Ring in Platinum.  This Art Deco engagement ring features a stunning 1.46 carat Old European cut diamond and .12 carats of diamond accents finished in platinum. The center stone is held by four rather large prongs that frame the stone for a nice secure seat. The shoulders are raised slightly off the band and are adorned with a string of small accent diamonds to complete this classic Deco ring.