Modernist Sterling Silver Ball Bead Ring , marked “JCOA” or “JOOA” and “925” Based on the design, this may have been made made Scandinavia in the late 1950’s or early 60’s. The ring size is approximately size 7, but due to the crossover shape there is a bit of give on the circumference. I believe the stones are natural amethyst, but have not had this verified by a jeweler.