This is a rare and classic vintage TIFFANY & CO  pin or brooch from the 1950s.  It is a ring of pearls set in 14 kt gold measuring

23 mm in diameter (just shy of an inch) , with 18 3 mm genuine pearls, weighing a total of approximately  4 grams.  It is signed TIFFANY & CO  and 14 kt on the clasp.  Looks like another mark on the clasp but I can't make it out.   Excellent  vintage condition.  No issues.