Art-Deco plaque ring in gold, platinum and old-cut diamonds

Plate ring in 18k (750°/°°) gold and platinum composed of two old-cut diamonds each weighing approximately 0.5 ct (J SI2, no inclusion visible to the naked eye) in a rectangular surround of 16 cut diamonds old mine cut for a total weight of approximately 0.7ct. Probably French work from the 1920s.

Tray dimensions: 1.8 x 1.3 cm
Finger size 52, sizing possible
Gross weight: 4.60 grams