Preliminary identification
Photo reference
1 uploaded photo
Overview
This is a footed glass tumbler featuring a classic pressed geometric diamond and fan pattern. What makes it truly magical is its delicate lavender-violet hue, which is not an artificial dye but a chemical reaction to decades of natural sunlight.
Story
Before World War I, American glassmakers added manganese to neutralize the green tint of iron impurities in sand. Decades of exposure to ultraviolet sunlight triggered a chemical reaction, turning this once-clear glass a beautiful, permanent lavender.
Maker / Origin
During the late 19th century, hundreds of glass factories thrived in Pennsylvania, Ohio, and Indiana, competing to create affordable, beautiful tableware for the growing American middle class. While the specific factory remains anonymous, this piece represents the peak of the Early American Pattern Glass (EAPG) movement.
Condition & Value
The glass appears bright and clear with no major visible chips or cracks. There is minor shelf wear on the bottom of the footed base, which is expected for its age. Excellent condition with strong purple coloration commands the higher end of the range.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
Build on this identification
Layer in sold comps, value drivers, and venue guidance.
Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.