Diamond ring

a round, openwork form set with a diamond in the so-called transition cut weighing about 0.10 ct (VS1/F-G)
and 15 diamond rosettes in the 8/8 cut weighing a total of about 0.15 ct (VS1-Si/E-G),
gold pr. 0.750, total weight 3.210 g. ring size 15
The product was made between 1920 and 1925.