Mood Rings
Photo credit: Photo: Moodman001, CC BY-SA 4.0, via Wikimedia Commons
A thermochromic crystal that supposedly read your emotions—blue meant calm, black meant stressed—except it mostly just measured how cold your hands were. The stone changed color with finger temperature, not feelings, but that didn't stop every kid from testing one against its color chart and knowing, deep down, it was a scam.
The mood ring was invented in the mid-1970s, though credit is disputed between jeweler Marvin Wernick and the duo Joshua Reynolds and Maris Ambats, who marketed it as a biofeedback tool. The original 1975 fad hit a reported $15 million in sales before collapsing. The thermochromic liquid crystal inside shifts color based on blood flow and finger temperature, and the color-to-mood associations (blue = calm, black = stressed) were never standardized between manufacturers, making the whole thing effectively a temperature gauge.
The 1990s brought a documented revival: a 1991 Chicago Tribune report described young entrepreneurs selling 100,000 rings in under three months, with Walt Disney World among the buyers. The nostalgic allure of a fake emotion-reader proved irresistible to 90s kids, and mood rings became a playground essential—even though everyone knew the truth.
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