Not sure if I have ever seen a ring that looks like this. It does not have a metal mark but was tested with nitric acid and a "kee" tester to be 18k yellow gold with a platinum top. It weighs 2.9 grams. The design reminds me of a church window. The blue stones set in the center look like glass which can be typical during the Art Deco Era, Set on each end are 4 rose cut natural diamonds. The ring measures 1" from North To South. It wears to a size 8 and can be resized.