Brand: Unbranded ***General Notes on Testing*** Markings and stamps are not taken as confidence. All jewelry is researched to our best avail and tested for precious metal content (when applicable). Gems and stones are tested with a Presidium Gemtester, and metals are tested with an Olympus Expert X-Ray machine. All stones, including organic materials such as pearls, coral, Bakelite and amber, are also tested and confirmed prior to listing.