Gold-tone herringbone-style flat chain necklace

This item is a flat, flexible metallic necklace featuring a herringbone-style weave, which creates a smooth, liquid-like appearance. The piece has a yellow gold-tone finish and appears to be made of plated base metal or a gold-colored alloy, though the specific composition cannot be verified from the image. It is equipped with a lobster claw clasp and finished with end caps where the chain meets the fastening mechanism. The user has attributed this piece to 'Avon SP', a claim that remains unverified as no hallmarks or maker's marks are legible in the provided photograph. The necklace exhibits a bright luster with minor visible surface wear consistent with light use. This style is consistent with costume jewelry produced during the late 20th century, specifically the 1980s or 1990s. Because no manufacturer's signature can be clearly seen, the identification remains a hypothesis based on its physical characteristics and decorative style. This type of jewelry was common in mid-market fashion collections and varies significantly in quality depending on the manufacturing origin.

I have examined the image provided of the gold-tone herringbone-style necklace. Based on what I can see, the piece features a flat, flexible weave characteristic of 1980s and 1990s costume jewelry. Per user submission, this item is attributed to 'Avon SP'. I cannot verify this manufacturer from the photo as no hallmarks or maker's marks are legible; I must treat this attribution as a hypothesis that would require physical inspection to confirm. The luster appears bright, suggesting a well-maintained plated surface, though I cannot determine the exact base metal or the thickness of the gold plating without scientific testing. The estimate of $15–$35 is based on the assumption that the 'Avon SP' attribution is correct, as items bearing this mark are consistent with mid-market fashion jewelry of the late 20th century. General market demand for unverified vintage costume necklaces of this style remains modest, as they were mass-produced. To confirm the value, an in-person examination would be necessary to locate a signature consistent with the Avon brand. If this piece lacks such a mark or is identified as an unattributed generic 'in the style of' reproduction, the value would typically decrease to the $5–$10 range. Conversely, if it were determined to be a higher-purity gold alloy rather than plated base metal, the value would be significantly higher based on its weight and current gold market rates. For a formal valuation, I recommend a hallmark verification by a specialist and a professional metal acid test or XRF analysis.