There are two common tests to determine the silver content in an alloy. X- ray testing is non-destructive but requires expensive equipment. Jewelry must be sent to a lab for x-ray testing. This test is relatively accurate on most silver items. The machine can be fooled by layered metals and some types of plating, so the accuracy is approximate. Assay testing is a destructive test that is more accurate. In this test, at least .5 grams of metal are melted down so the alloyed elements and ratios can be accurately measured. Neither of these tests are a practical option for consumers looking for a quick test at home. Em vez de, consumers are advised to buy silver from reputable manufacturers that are honestly disclosing details on their materials.