diamond and platinum ring

A fine platinum Art Deco ring set with a step cut diamond (circa 1.1 carat, F, vs1), in a mounting of baguette and carré cut diamonds (circa 0.5 carat) that give the give an overall appearance to be adorned with a diamond of over 3 carats, circa 1925, France.

weight: 3.2 gram
ring size: 16 mm. 5 1/4 US.