Lovely faceted crystal stones in the Radiant rectangular cut set into sterling silver metal with screw backs to the reverse for closure. They are signed JAPAN and SILVER on the reverse screw backs, they were made sometime in the 1930s-1940s era. I have not had the stones tested, but it is possible that they are quartz crystal as what is generally found in this era. There are no inclusions, so I cannot say for sure. They have been well cared for and are in very good vintage condition without any chips or cracks to the stones. Please see photos for approximate measurements and details.