Topic
Treatment
Treatment entries on Zultpedia document why gem-quality color-change diaspore is sold untreated: no commercially viable enhancement exists for the species, and the alexandrite optical phenomenon is structural and chromophoric rather than amenable to heat or irradiation. Includes comparisons to treated competitors.
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Gem Article
Zultanite Lab Reports — Why “No Treatment” Is the Documented Norm
A genuine Zultanite (color-change diaspore) laboratory report from GIA, IGS, or a recognized national lab will explicitly state "no evidence of treatment" in the treatment-disclosure section. This is the documented norm for…
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Gem Article
Zultanite — Fracture-Filling and Coating Detection in Gemological Labs
Fracture-filling and surface-coating treatments are not standard for Zultanite (color-change diaspore), but laboratories test for them as part of the standard identification protocol. FTIR spectroscopy detects organic resin fillers; surface inspection under…
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Gem Article
Why Zultanite Is Sold Untreated
Color-change diaspore is sold without heat, irradiation, fracture-filling, or surface coating treatments because none of those treatments would produce a useful effect: the alexandrite optical phenomenon is structural and chromophoric, not amenable…
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Gem Article
Common Treatments on Other Color-Change Gems — and Why Diaspore Is Different
Color-change sapphire is routinely heat-treated to enhance color and clarity; color-change garnet is occasionally heat-treated. Synthetic color-change sapphire is widely produced. Diaspore stands apart: gem-quality color-change diaspore is sold untreated because no…