Both in color and shape, this clasp looks live an olive. It would be perfect with green or brown pearls. It has lovely shading with a deep green to brown color running underneath that moves as the clasp moves. It is really an understated and beautiful piece of glass. It is vintage from the 1940s made in Germany. The centerpiece is 13 by 18 mm. The clasp measures 30 mm from ring to ring. The centerpiece is set in a sterling silver box clasp.