Art Deco, platinum, diamond engagement ringThis ring is sold, sorry. See similar rings: Metal: platinum rings Gems: diamond rings Type of ring: engagement rings, Art Deco rings Diamond engagement ring. The diamond solitaire is an enduring favourite for engagement rings, and this antique Art Deco ring is a particularly attractive example, perhaps more interesting and characterful than most modern equivalents, with a lovely early 20th century circular cut diamond at its centre, and single cut