Reference
Zultanite Articles
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Article gemmologique
Guide d’achat de la zultanite — les questions à poser avant d’acheter
Before buying Zultanite, ask four things: Does the stone show a real, reversible colour change under daylight and warm light? Is it natural, untreated colour-change diaspore? Does it come with a report…
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Article gemmologique
La zultanite est-elle plus rare que le diamant ? Lire les affirmations
You will see Zultanite called “10,000” or even “11,000 times rarer than diamond,” but these numbers vary between sellers and do not trace to a measured, primary source — and “rarer than…
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Article gemmologique
Zultanite rose et lilas — pourquoi ces tons comptent
Pink and lilac are the warm-light face of color-change diaspore (Zultanite). Under incandescent light or candlelight, many stones shift from green toward raspberry-pink and lilac. This warm state is specimen-dependent and is…
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Article gemmologique
Redimensionnement de la zultanite — pourquoi la mise à la taille à chaud menace la pierre
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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Article gemmologique
Serti de la zultanite — serti clos ou serti à griffes : arbitrage de durabilité
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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Article gemmologique
Zultanite — détection du comblement de fractures et des revêtements en laboratoire
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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Article gemmologique
Rapports de laboratoire sur la zultanite — pourquoi « aucun traitement » est la norme documentée
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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Article gemmologique
Cadence de vérification et gestion de la dérive sur la zultanite
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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Article gemmologique
La hiérarchie des sources de Zultpedia pour les entrées zultanite
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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Article gemmologique
Comment Zultpedia arbitre les sources contradictoires sur la 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…