This ring has a beautiful and very old Satsuma porcelain button as the gemstone. The button is c1900. It depicts a noh mask from the classical Japanese musical drama. The button is set in 18K sterling silver vermeil. The front of the ring measures 21mm. It is stamped silver on the inside back band. The ring was most likely made as a souvenir in the 1930s. It is nicely made and in very good condition. The ring is a size 7.25. It is a very pretty and unusual ring.