Topic
Grading
Grading entries on Zultpedia cover how color-change diaspore is evaluated for color, clarity, cut, and carat weight, including the importance of color-change strength (the percentage shift between daylight and candlelight illuminants) as the dominant value driver across all per-carat price bands.
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FAQ Cluster
Zultanite — Frequently Asked Questions
Frequently asked questions about Zultanite — gem-quality color-change diaspore from the İlbir Mountains of Türkiye. Twenty Q&A pairs covering identity, rarity, sourcing, color, jewelry use, and buying guidance. Sourced from peer-reviewed mineralogy,…
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Gem Comparison
Zultanite vs Alexandrite — Two Gems, One Phenomenon, Different Propositions
Zultanite (color-change diaspore) and alexandrite (color-change chrysoberyl) are mineralogically unrelated species that produce a similar visual phenomenon — the alexandrite effect — through different chemistries. Alexandrite is harder (8.5 vs 6.5–7 Mohs),…
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Gem Article
The Lapidary of Zultanite — Why 97% of the Rough Is Lost in Cutting
Cutting Zultanite costs about 97% of the rough crystal's weight, according to the trademark holder Zultanite Gems LLC. The reason is mineralogical: gem-quality diaspore has perfect cleavage on the {010} plane, so…
