Heliotrope rock stone clasp

Rock stone was invented by the Germans in the 1950s as a fancy name for one of their glass effects. It is pretty nifty. The surface is raised and pebbly. The color is delphinium blue with flashes of purple. The purple is deep around the bevel edge of the rock stone and light in the middle, under the blue. If is a very interesting effect that I have not seen replicated in modern glass. You should really order one. The centerpiece is 14 mm by 20 mm. The centerpiece is set in a sterling silver box clasp. The clasp is 32 mm from ring to ring.