Vintage-style yellow metal ring with oval faceted clear stone

This item appears to be a ring featuring a central oval faceted clear gemstone, set within a yellow-colored metal mounting. The stone is translucent and appears to be color-neutral, though its specific mineral composition (e.g., quartz, topaz, or glass) cannot be determined without physical testing. The setting is characterized by a decorative, scalloped or floral-inspired halo that radiates outward from the center stone. This surround features textured or engraved detailing consistent with early to mid-20th-century aesthetic styles. The metal possesses a duller yellow luster, suggesting either gold-plating or a low-karat gold alloy, though no hallmarks are visible in the image to corroborate the metal's purity. The band is a simple, slender round shank. Regarding condition, there is visible surface wear across the metal components and potential minor abrasions to the stone's facets, though the overall structure appears intact. The identification is hedged as vintage-style because no maker's mark or specific provenance is readable from the photograph, and the design could either be a period piece or a later revival. The ring is presented in a light gray velvet-textured jewelry box.

I have examined the image provided of the yellow metal ring featuring an oval faceted clear stone. Based on what I can see, the piece reflects a vintage-inspired aesthetic, possibly from the mid-20th century or a later revival. However, I cannot verify the specific metal content or the chemical composition of the stone through a photograph alone. The lack of visible hallmarks suggests the metal may be gold-plated base metal or a low-karat alloy, and the stone could range from glass to quartz or synthetic spinel. The value estimate of $60 to $150 is based on the assumption that this is a vintage costume or bridge jewelry piece in good structural condition, despite visible surface wear. The higher end of the range would apply if the metal is found to be 9k or 10k gold upon physical testing. If the item is determined to be a contemporary mass-produced reproduction using inexpensive base metals and glass, the value would likely drop below $20. Conversely, if an in-person examination reveals the stone is a natural diamond or white sapphire and the metal is high-karat gold, the value would significantly exceed this estimate. To arrive at a more precise valuation, I would need to perform a physical inspection including a stone hardness test, a metal acid test or XRF analysis to verify purity, and a search for internal hallmarks or maker's marks not visible in the photograph. Documentation regarding provenance would also be necessary to move beyond a hypothetical attribution.