Pair of tapered glass tumblers with Kagami-style labels

This pair of glass tumblers features a tapered cylindrical form with a deep ruby or 'pigeon blood' red coloration. Each vessel bears a rectangular metallic label with a stylized bird icon, a 'G', and the text 'KAGAMI CRYSTAL'. One label appears gold-toned while the other is silver-toned, though this may be an effect of lighting. The glass is semi-translucent, appearing very dark near the base and brightening toward the rim. The right-hand vessel demonstrates a bright orange internal glow, which the owner identifies as a reaction to 365nm UV light consistent with cadmium glass; however, this chemical composition remains unverified without professional laboratory testing. The user also attributes these to Kagami Crystal, a claim consistent with the visible labels but requires in-person verification as labels can be reproduced or transferred. The glass appears to be in excellent condition with no visible chips, cracks, or significant surface scratching. The craftsmanship is consistent with high-quality mid-to-late 20th-century Japanese crystal production, characterized by uniform color density and high clarity. The identification is based on the visible stickers, though these markings are themselves unverified without physical inspection.

I have examined the submitted images of this pair of tapered tumblers. The vessels feature a deep ruby coloration and bear labels consistent with those used by Kagami Crystal. Per user submission, the glass is attributed to Kagami and is reported to exhibit a cadmium-based orange glow under 365nm UV light. While the fluorescent reaction is typical of certain mid-century glass compositions, I cannot verify the chemical makeup or the origin of these pieces through photos alone. The presence of metallic labels is a strong indicator, but labels can be moved or reproduced; thus, this remains a working hypothesis rather than a fact. Based on what I can see, the glass appears to be in excellent condition with high clarity and uniform color density. The market typically values vintage Japanese crystal of this style between $100 and $200 for a pair, assuming the Kagami attribution is accurate. The value is driven by the perceived quality of the glass and the collectibility of the brand. If these were determined through physical inspection to be modern reproductions or unattributed 'in the style of' pieces, the value would likely drop to $30-$50. To reach a more stable valuation, a physical examination would be required to verify the weight, clarity, and the integration of the labels, alongside a review of any original packaging or provenance documentation. This estimate assumes the items are as described by the user and is subject to verification by a qualified crystal specialist.