Olbia’s Treasure Pin is a replica from a Greek Necklace ca. 200 B.C. Made of gold plate over lead free pewter and Black Onyx. The dimensions of the pin are 3.8cm x 3cm. The dimensions of the Black Onyx setting are 2.2cm x 1.7cm. Hallmarked and comes with a description about the pin. Sent in a gift box for your convenience.