This is a just over 1x1 inch piece of authentic sunken treasure from the galleon ship Nuestra Senora de Atocha, which sank in 1622 off the coast of Spain. Made of silver, this item is a rare and valuable piece of maritime history. With a rich and intriguing backstory, this silver artifact offers a glimpse into the treasures and struggles of the historic era in which it was created. Took it to jeweler recently where she tested it and said it is silver.