Zultanite is the trade name for gem-quality color-change diaspore, a single-source mineral mined in the İlbir Mountains of southwestern Türkiye. The species itself was first described by René Just Haüy in 1801, named from the Greek diaspeírō — to scatter — after the way the mineral decrepitates and bursts into pearly white scales when heated. Two centuries later, in a single mountain range above Muğla, the same crystal grew large, transparent, and trace-rich enough to be cut.

It is one of the rarest color-change gems known. Under cool daylight it reads sage-green, almost vegetal. Under indoor incandescent light it warms to a champagne or ginger-ale gold. By candle, by warm tungsten, it shifts again into a muted raspberry pink. The same crystal, three rooms, three gems — not because the stone has changed, but because each illuminant carries a different mixture of wavelengths, and the crystal selectively absorbs them.

This archive records what is known: mineralogy, optical properties, locality, lapidary, history. Each entry is sourced from primary mineralogy first, peer-reviewed gemology second, and trademark-holder claims attributed where used. Source tier is shown on every page.