Vintage Carved Shell Cameo Pin / Pendant in 800 Silver

Vintage 1970s 800 silver cameo pin / pendant. It has a loop that needs a jump ring on the back so that it can accept a chain.  It had a locking clasp, but the lock is missing so it now works like a "J" clasp. Measures 1 3/8" tall. Weight: 6 grams. Marked 800.