Costume jewelry butterfly pendant necklace in a tennis-chain style

This item appears to be a contemporary costume jewelry necklace featuring a large butterfly pendant. The necklace consists of a single strand of what are stylistically consistent with round-cut glass or synthetic clear stones, individually set in a metallic tennis-style chain. The butterfly pendant is heavily embellished with smaller pavé-set stones across the wings and body, with two antennae detailings at the top. The metal appears to be a silver-toned alloy, showing visible signs of surface wear and oxidation or tarnishing, particularly on the chain links and the pendant's bail. The construction suggests mass-production, typical of late 20th or early 21st-century fashion jewelry. The bail is also encrusted with stones and connects the pendant to the chain via a simple hoop. No visible hallmarks, maker's marks, or signatures are present in the image to indicate a specific brand or designer; as such, any attribution to a maker is unverified. The owner identifies this item as a 'Necklace,' which is consistent with its form. The stones appear to be glued or tension-set rather than traditionally prong-set by an artisan, which is characteristic of affordable costume pieces. Overall, the item is in used condition with noticeable darkening of the metal finish.

Based on my visual analysis of the provided image, I have examined this contemporary butterfly pendant necklace. From what I can see, the item is a mass-produced costume piece featuring a tennis-style chain and a pavé-set butterfly charm. The materials appear to be clear glass or synthetic crystals set into a silver-toned base metal alloy. I cannot verify the metal's purity or the stones' composition from a photograph; however, visible surface wear and oxidation on the bail and links strongly suggest a plated base metal rather than a precious metal like sterling silver. The construction demonstrates characteristic 'fashion jewelry' techniques, such as glued or tension-set stones rather than fine jewelry prong settings. No hallmarks or maker's marks are visible, so I am treating this as an unattributed piece. Per the user submission, this is identified generally as a 'Necklace.' The value for an item of this type is primarily driven by its aesthetic appeal as a fashion accessory rather than intrinsic material worth. This estimate assumes the item is non-designer costume jewelry; if it were associated with a specific high-end fashion brand, the value could increase slightly, whereas it would sell for significantly less ($5-$15) at a secondary market level such as a thrift venue. General market demand for butterfly-themed fashion jewelry remains stable, though the noted tarnishing negatively impacts the value. To confirm this estimate, physical inspection would be required to test metal content and stone hardness. For a more formal valuation, provenance or original packaging would be beneficial.