Art Deco style ring with diamonds

1 diamond weighing about 0.56ct H/VS2-SI1
6 diamonds weighing a total of about 0.12ct H-I/VS-SI
product weight: 3.30g, pr. 0.750 gold + platinum
Exceptional, beautifully ornamented ring made of high-grade gold and platinum with a diamond in old European cut and diamonds set in a very elaborate geometric form of a rectangle with truncated corners with fine cutouts. A sought-after author's work by an old master jeweler