Vintage mid century Modernist ring by Kupitaan Kulta of Turku, Finland, made of sterling silver and set with two spheres of chrysoprase, each set cleverly within a double cage resembling two clam shells. This looks like an example of the Kupitaan Kulta 1960's "kinetic" jewellery. The ring is adjustable, but set at size 7. Inside the shank is the long cartouche with the anvil hallmark for Kupitaan Kulta, Turku , Finland and the silver mark "925S". The ring can be cleaned to a high polish. I have left some of the tarnish on it, and the patina of age. The ring weighs 7.4 grams . The condition is excellent.