Reference
Zultanite Articles
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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 Ring Settings — Bezel vs Prong Durability Trade-Offs
A bezel setting protects Zultanite (color-change diaspore) better than a prong setting because it surrounds the entire girdle with metal, distributing point impacts that could otherwise propagate the perfect {010} cleavage. Prong…
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Gem Article
Zultanite Resizing — Why Heat-Based Ring Sizing Threatens the Stone
Standard ring-resizing techniques use a torch flame to soften the metal shank. Zultanite (color-change diaspore) cannot tolerate the resulting thermal shock without significant cleavage risk because the {010} cleavage plane responds to…
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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
Zultpedia Source Hierarchy for Zultanite Entries
Zultpedia operates a three-tier source hierarchy. Tier I: primary mineralogy and major gemological authorities (Mindat, GIA, IGS, Mineralogical Society of America, Wikipedia for peer-reviewed mineral pages). Tier II: peer-reviewed papers and recognized…
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Gem Article
Mining Conditions at the İlbir Mountains — Zultanite Source Geology
Gem-quality color-change diaspore is mined in the İlbir Mountains of Muğla Province, southwestern Türkiye. The mining operation is small-scale and selective: rough is hand-picked from metamorphic pockets within bauxite-derived deposits, then transported…
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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…
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Gem Article
How Zultpedia Resolves Conflicting Sources on Zultanite
Where two reputable sources disagree on a value or claim, Zultpedia presents both with attribution and source-tier marking, rather than picking one. Example: Wikipedia gives diaspore's specific gravity as 3.1–3.4; Zultanite Gems…
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Gem Article
Zultanite Fact-Check Cadence and Drift Management
Every entry in the Zultpedia archive on Zultanite (color-change diaspore) is reviewed at minimum annually for fact-check drift. Property values, citations, and per-carat figures are spot-checked quarterly against the original sources. The…