Bezel-set chalcedony or agate disk

This item appears to be a small, circular decorative object, possibly a jewelry component or a button, featuring a translucent stone disk consistent with chalcedony or polished agate. The stone center exhibits naturally occurring milky-white and tan inclusions within a greyish-translucent matrix. The disk is secured within a metallic bezel setting that appears to have an aged, textured, or possibly gilded finish along the serrated rim. The outer side of the setting has a silvery, matte appearance with a pitted or hammered texture, suggesting a cast metal construction. There are no visible hallmarks, signatures, or maker's marks observable in the image, making a definitive attribution to a specific manufacturer or studio impossible without physical inspection and testing of the metal and stone. The craftsmanship is consistent with mid-to-late 20th-century costume jewelry or artisanal lapidary work. Some wear is visible along the outer edges of the setting, and the stone surface shows minor surface dust. The owner notes that the item was 'found', a claim which remains unverified as to the specific location or context of its discovery. Without further marking, this is categorized stylistically as a semi-precious stone ornament.

Based on my visual analysis of the provided image, this item appears to be a bezel-set semi-precious stone ornament, likely composed of chalcedony or agate. From what I can see, the stone exhibits natural inclusions while the setting displays a textured, matte finish consistent with base metal or a silver-toned alloy. I cannot verify the metal's purity or the stone's specific mineralogical identity without physical testing. The construction suggests an artisanal or mid-to-late 20th-century costume jewelry origin. Because there are no visible hallmarks or maker's marks, any attribution remains a hypothesis. The owner notes the item was 'found', a claim I cannot verify regarding context or historical significance. My estimate of $40–$85 is based on the assumption that this is a handcrafted boutique item using common semi-precious materials. If the metal were confirmed as sterling silver through acid testing, the value might increase toward the higher end of the range ($75–$120). Conversely, if the setting is a modern cast reproduction using synthetic materials, the value would likely drop below $20. General market demand for unattributed mid-century style lapidary work is stable but modest. To confirm the value, a physical inspection is required to test metal fineness, examine the stone's refractive index, and search for micro-stamps that are not visible in the photograph. Documentation regarding its 'found' status would also be necessary to establish any provenance-based value.