Topic
Identification
Identification entries on Zultpedia cover how to distinguish genuine Türkiye-source color-change diaspore from synthetic color-change sapphire, color-change garnet, color-change fluorite, and other-locality natural diaspore. Includes the field-test protocol, dichroscope and refractometer use, lab-report interpretation, and laboratory-grade trace-element analysis (LA-ICP-MS).
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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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Property Guide
Optical Character of Zultanite — Biaxial Positive
Zultanite is biaxial positive: light traveling through the crystal splits into two rays with three principal refractive indices (nα 1.682–1.706, nβ 1.705–1.725, nγ 1.730–1.752), with nβ closer to nα than to nγ.…
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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…
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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
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
Export Documentation for Türkiye-Sourced Zultanite
Türkiye-sourced color-change diaspore exported for the international gem trade typically carries documentation including a Türkiye Mineralogical Heritage attestation, customs declarations citing HS code 7103 (precious and semi-precious stones), and where applicable a…
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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
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 Comparison
Zultanite vs Ametrine — Color Change vs Color Zoning
Zultanite shows color change (full body color shifts under different illuminants) while ametrine shows color zoning (purple amethyst and yellow citrine zones in the same crystal, both visible under any light). Both…
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Gem Comparison
Zultanite vs Opal — Color Change vs Play-of-Color
Zultanite shows color change (the same crystal showing different colors under different illuminants) caused by trace iron and chromium absorbing different wavelengths from each light source. Opal shows play-of-color (rainbow flashes from…
