An Art Deco diamond plaque ring

An Art Deco diamond plaque ring, the central old cushion-cut diamond estimated to weigh 0.85 carats, set to the centre of a geometric design plaque, set throughout with fourteen old-cut and four baguette-cut diamonds, estimated to weigh a total of 1.1 carats, millegrain-set to platinum on a yellow gold mount with diamond-set shoulders, bearing import hallmarks of former USSR, gross weight 4.2 grams, circa 1930s.

No. 29694M