Mixed-stone pendant in the Art Nouveau style

This necklace pendant features a central iridescent cabochon, stylistically consistent with mother-of-pearl or a moonstone, surrounded by a scalloped metal frame. Attached as accents are smaller round stones that appear to be opals, exhibiting characteristic 'play-of-color' including greens, blues, and oranges. The owner identifies this as a pearl and opal pendant, which is consistent with the visual presentation, though stones have not been gemologically verified. The metal surface shows significant dark patina or oxidation throughout, particularly in recessed areas. On the reverse, the pendant bears a stamped mark reading '925', which is consistent with sterling silver; however, this marking is unverified without chemical testing. Adjacent to this is a small circular hallmark or maker's mark that is illegible due to resolution. The construction features three integrated jump rings for chain attachment, creating a tripod-style drop. Overall, the design and darker oxidation are consistent with vintage-style or late 20th-century revivalist jewelry. The item shows signs of wear and surface scratches, while the stones appear securely bezel-set.

I have reviewed the provided image and description for the pendant identified by the owner as a 'Pearl opals pendant 925 vintage.' Based on what I can see, the item features an aesthetic consistent with Art Nouveau revivalist jewelry, likely produced in the late 20th century. The central cabochon possesses an iridescence suggesting mother-of-pearl, while the accent stones exhibit a play-of-color consistent with opal; however, I cannot verify the organic or synthetic nature of these stones from a photo alone. The metal surface bears a '925' mark and a dark patina consistent with sterling silver, but this remains a hypothesis without chemical testing. The value estimate is based on the assumption that the stones are natural and the metal is sterling silver. In the current market, secondary demand for unbranded, revivalist silver jewelry is moderate, with value driven primarily by aesthetic appeal and material content. If the stones are found to be glass or synthetic, or if the metal is a silver-plated base metal, the value would likely decrease to the $15–$30 range. To confirm this estimate, a physical inspection is required to perform a streak or acid test for silver purity and a gemological examination to determine if the opals are solid, doublets, or synthetic. An illegible hallmark is noted; if this were identified as a known maker through high-resolution macro photography, the value could potentially increase. Without provenance or verified markings, the piece is valued as a decorative vintage-style accessory.