Topic
Durability
Durability entries on Zultpedia cover the practical jewelry implications of Zultanite’s 6.5–7 Mohs hardness combined with perfect {010} cleavage: appropriate setting choices, daily-wear scenarios, cleaning protocols, and the difference between scratch-resistance and toughness.
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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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Property Guide
Cleavage of Zultanite — Perfect on {010}
Zultanite (gem-quality color-change diaspore) has perfect cleavage on the {010} crystallographic plane. This is the dominant durability constraint for the gem: a sharp impact aligned with that plane can cleave the stone…
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Gem Article
Cleaning and Storing Color-Change Diaspore
Clean color-change diaspore only with warm soapy water and a soft brush. Never use ultrasonic cleaners (vibrations can propagate the {010} cleavage), never use steam (thermal shock risk), and avoid acidic or…