Vintage Danish modernist Carl Ove Frydenberg sterling silver ring with lozenge shaped rose quartz, ca. 1950-1960. Clearly stamped in a circle inside shank, "Sterling Denmark" and the initials "COF". See Razazadeh "Silver Jewelry", page 97 for biographic information. Ring size 7 1/2 ; Length of setting 1 1/4 inches; Width of setting 5/8 inch. Very good condition with surface wear. Sold as is.