Zultanite, Csarite, Ottomanite, and Turkizite are all trade names for the same mineral — gem-quality color-change diaspore (α-AlO(OH)) from the İlbir Mountains of Türkiye. Mineralogy, source, and physical properties are identical. The names differ only in the brand-holder commercial strategy, not in what the gem actually is.

Mineralogy

Both gems require a thorough comparison across crystal system, hardness, refractive index, specific gravity, and optical character. See the property guides for the verified values on each axis.

Source and supply

Where each gem is mined and how supply is structured determines availability and price stability.

Optical phenomenon

Color-change diaspore (Zultanite) and andalusite differ in the physics of their optical drama. Color change depends on illuminant; pleochroism depends on viewing angle.

Jewelry suitability

Hardness, cleavage, and toughness govern which gem suits ring-grade vs occasional-wear jewelry.