platinum ring with diamond

A delicate platinum Art Deco ring with a rectangular concave panel set with 23 old European cut diamonds and one (replaced) modern brilliant cut diamond (app. 1.68 ct., H-I / VS) with open worked sides, France, circa 1925.

weight: 2.55 grams
ring size: 16.5 mm / 6 US
dimensions panel: 18 x 10 mm