This is a beautiful all original Art Deco filigree Diamond ring. The ring has one center Diamond--old European cut--weight of 1.18 ct, SI 2, LM color. Four small single cut Diamonds on the shoulders. There are 4 heavy prongs holding the Diamond. The filigree work is lovely on the shoulders, with some nice detail going down halfway. The metal is not stamped but did test with acids for platinum. Ring size is 5 3/4 and can be re-sized by any good jeweler who works in platinum. Condition is very good for age, some normal wear to the metal and some thinning on the band, but plenty of metal left to size. I would date this fine ring at c1920's-1930's.