Vintage Sterling Cultured Pearl Clam Shell Charm. This estate jewelry find will make a very nice addition to your charm bracelet. The textured open clam shell is adorned with a single cultured pearl. It's open design give a nice puffed appearance to the charm or pearl pendant. It measures about five eighths of an inch by three quarters of an inch. The silver has mellowed to a lovely time enhanced patina that looks amazinf in the nooks and crannies of the sea shell. No flaws detected.