Gold-tone herringbone chain necklace with marquise pendant

This piece consists of a flexible, flat gold-tone herringbone chain necklace featuring a stylized V-shape drop at the center holding a single, faceted marquise-cut clear gemstone (or imitation diamond) pendant in a prong or bezel setting. The chain exhibits a polished, reflective finish characteristic of mid-to-late 20th-century costume jewelry or unverified precious metal pieces. The clasp mechanism at the back appears to be a standard box-insert or fold-over clasp typical of flat chain designs, and a small tag or sticker is visible attached to one side of the chain. No hallmarks, maker's marks, or stamps are clearly legible from the provided photograph; the identification rests entirely on the visual characteristics of the chain style and pendant arrangement. The overall condition appears generally intact with some surface reflectivity maintained, though minor wear, micro-scratching, or plating loss cannot be ruled out without physical inspection. The style is consistent with fashion jewelry popular in the latter half of the 20th century, often associated with retro or glamorous evening wear aesthetics.

Based on what I can see in the photograph, this piece appears to be a mid-to-late 20th-century fashion jewelry item featuring a flexible gold-tone herringbone chain and a central marquise-cut clear stone pendant. I cannot verify from a photo whether the metal is gold-plated base metal or a precious alloy, nor can I confirm the composition of the clear gemstone without physical inspection. No legible hallmarks or maker's marks are visible to establish a brand attribution. My valuation of $50 to $150 reflects typical market behavior for vintage costume jewelry of this style and assumed composition. If physical testing were to reveal that the item is crafted from solid gold and set with genuine diamonds, the value would increase significantly; conversely, if it is determined to be a modern reproduction or if plating wear is more extensive upon close inspection, the value would likely fall toward the lower end or below this estimated range. To confirm authenticity, metal composition, and gemstone quality, an in-person examination, hallmark verification, and professional testing by a qualified gemologist or jeweler would be necessary.