This is a lovely Art Deco ring. It is hallmarked for 18K white gold, but the stamp is almost gone, so I re-tested the metal. It tests as 18K gold. The filigree work is lovely and delicate. There are 2 white Sapphires on the top, and 8 smaller white Sapphires around the top. There are 4 rectangular synthetic Sapphires to accent. The 2 larger White Sapphires measure approx. 5mm round each. I am not a gemologist so I cannot give you caret weight. The top of the ring measures 7/8" X 5/8". Weight is 3.7grms. Ring size is 5 3/4, but could easily be re-sized by any good jeweler that works with antique jewelry. Great Art Deco ring, c1920's.