This is an awesome space age design. The chunky sterling and onyx pin reminds me of that era. Pin is sterling with an onyx center and can also be worn as a pendant. The pin was made in Mexico and is marked 925. It is 2" x 1 3/4". The chain is cut so it has dark elements ad it looks great with the pendant. Chain is 24' long and made in Italy and is marked 925. I love convertible jewelry. It is like getting two for the price of one. This pin and chain weigh about 42 grams and are in excellent condition. The pin has old patina which you may leave or polish away.