Ruby and clear glass stemware

This piece of stemware features a deep ruby-colored bowl paired with a contrasting elongated, slender clear glass stem and a flat circular foot. The glass exhibits distinct reactions under ultraviolet light, which the owner reports as a 365nm blacklight showing an orange glow on the ruby bowl, indicative of cadmium or selenium content, and a light blue fluorescence along the stem, suggesting the presence of cerium. No maker's marks, signatures, or stamps are visible in the provided image. The item appears consistent with decorative or art glass production from the late 19th to mid-20th century, though its exact age and manufacturer remain unverified. The craftsmanship displays fine proportions, particularly in the delicate, elongated stem supporting the substantial bowl. The owner's notes describe the item as a 7-inch tall ruby liqueur glass with a clear stem, and while the visual and UV-reactive characteristics are consistent with period glass manufacturing techniques, these user-supplied details and attributions are unverified by physical inspection.

Based on the visual evidence in the provided photograph, I can observe a ruby-colored bowl paired with an elongated clear glass stem and flat circular foot, styled as a liqueur glass. Per user submission, the piece stands approximately 7 inches tall and exhibits specific ultraviolet light reactions under a 365nm blacklight—showing an orange glow on the bowl suggesting cadmium or selenium content, and a light blue fluorescence along the stem suggesting cerium. Based on what I can see, the proportions are fine and consistent with decorative or art glass production from the late 19th to mid-20th century. However, I can't verify from a photo whether the ultraviolet responses indicate specific period formulas or later reproductions sharing similar chemical additives. No maker's marks or signatures are visible, and I would need physical inspection to confirm the manufacturing technique, age, and condition. Assuming the user's observations and the piece's period characteristics are accurate, comparable decorative art glass stemware of this type typically trades in the $45 to $85 range in current antique and vintage markets, driven by collector interest in reactive glass. If physical inspection reveals the item to be a later replica, copy, or produced 'in the style of' rather than a period piece, the value would likely decrease to the $15 to $30 range. To establish a more precise valuation and confirm authenticity, in-person examination by a qualified glass expert and potential scientific testing of the glass composition would be necessary.