How can I tell if sterling silver is antique?

Sterling silver is considered antique if it was made over 100 years ago. Many antique sterling silver items will have a mark or stamp. First, clean the item and check for marks. A “925” mark indicates a silver purity of 92.5 percent, which is the composition of sterling silver. If you don’t see a mark, work with a certified appraiser to acid test the item and determine the silver content. You’ll find expertly vetted antique sterling silver items on 1stDibs.