gemstone

Mystic Topaz

Coated Al2SiO4(F,OH)2

Hardness: 8.0 on Mohs scale. Color: Iridescent multihued (purple, blue, green). Luster: Vitreous. Crystal structure: Orthorhombic. Cleavage: Perfect basal.

Hardness: 8
Color: Iridescent multihued (purple, blue, green)
Luster: Vitreous

Identified July 13, 2026More gemstone →

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Physical properties

Hardness: 8.0 on Mohs scale. Color: Iridescent multihued (purple, blue, green). Luster: Vitreous. Crystal structure: Orthorhombic. Cleavage: Perfect basal.

Formation & geological history

Natural colorless topaz that has been treated with a thin layer of metallic titanium or chromium atoms using a physical vapor deposition (PVD) process. The base topaz usually originates from pegmatites or hydrothermal veins.

Uses & applications

Primarily used in jewelry such as rings, earrings, and pendants due to its brilliant play of colors and high hardness.

Geological facts

The 'Mystic' effect is not a natural occurrence; it is a surface treatment. If the coating is scratched or the stone is recut, the iridescent effect will be lost and the underlying clear topaz will be visible.

Field identification & locations

Identify by its characteristic rainbow surface sheen that changes with the angle of light. Common in commercial jewelry markets globally. The regional coordinates provided (Indonesia) are known for gemstone markets where treated stones like this are frequently traded.