Made in Czechoslavakia, these glass cabochons have a low dome top and a flat back. We also have some inventory of the same items made in Japan originally. With a 2mm hole in the center of the top, these are originally designed as ring stones with the idea that decorative centers could be inserted or attached to them. You can also use the holes for stringing them into necklace designs or more. Very versatile in how they can be used.