Iridescent glass fragment in the style of ancient Roman glassware

This object is a small, curved shard or fragment of thin glass, featuring a tapered or arc-like shape. The surface displays significant iridescence and opalescence, with a prismatic 'oil-slick' coloration including pink, green, and silver hues. This visual effect is consistent with solarization and chemical weathering over a long period of interment, often referred to as a silver or rainbow patina. The glass appears translucent where the patina is thinner and shows slight mineral encrustation and pitting on the surface. There are no visible maker's marks, signatures, or inscriptions. The owner identifies this as a first-century AD Roman glass sherd from the Jewish Quarter of Jerusalem; however, this provenance is unverified without physical laboratory testing and excavation documentation. Stylistically, the thinness and iridescence are consistent with glass production from the Roman period (circa 1st–4th century AD). The item is in a fragmented state with sharp, irregular edges, typical of archaeological glass finds.

Based on the provided imagery, I have examined this curved glass fragment which displays a prismatic iridescence consistent with the chemical weathering seen on ancient Roman glassware. The owner identifies this as a first-century AD sherd found in the Jewish Quarter of Jerusalem; however, I cannot verify this specific provenance or the exact age from a photograph alone. The 'silver patina' observed is a hypothesis based on visual indicators of solarization and mineral encrustation, which are common in archaeological glass but can also be simulated or occur in more modern discarded glass under specific soil conditions. My estimate assumes the attribution to the Roman period is correct. Small, non-diagnostic fragments (sherds that are not part of a rim, handle, or base) are frequently found in large quantities across the Levant and Mediterranean. While historically significant, such fragments occupy a high-volume, low-price point in the antiquities market. If this item were accompanied by documented archaeological excavation records or underwent physical laboratory testing to confirm its 2,000-year-old chemical structure, it would sit at the higher end of the range for collectors of ancient fragments. Without such documentation, it is valued as an interesting educational specimen. Should the piece be a modern glass fragment with a chemically induced 'style of' patina, its market value would be negligible, likely under $5. Demand for minor Roman glass sherds remains steady among entry-level collectors, though value is heavily capped by the lack of a complete form or unique diagnostic features.