Tiger’s Eye Value, Price, and Jewelry Information

Tiger's Eye (Quartz): South Africa (rough mass ~ 3 inches long; blue and red cabochons are dyed). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Tiger's Eye

Tiger's Eye Information

Data Value
Name Tiger's Eye
Is a Variety of Quartz
Varieties Falcon's Eye
Colors Golden brown (Tiger's eye); Blue (Hawk's eye); some pieces show both colors.
Crystallography Hexagonal.
Refractive Index 1.544-1.553
Luster Vitreous.
Hardness 7
Wearability Very Good
Fracture Conchoidal
Specific Gravity 2.55-2.91
Birefringence 0.009
Cleavage None
Dispersion 0.013
Enhancements Bleaching, dyeing. Heat may create the eye effect.
Typical Treatments Bleaching, Dyeing, Heat Treatment
Transparency Opaque.
Absorption Spectrum Not diagnostic.
Phenomena Chatoyancy.
Optics

= 1.544; = 1.553 (very constant). Uniaxial (+).

Optic Sign Uniaxial +

Crocidolite, (blue asbestos,) alters to quartz, but while retaining its fibrous structure. This material is frequently stained by iron, giving it a golden brown color. We know this material as tigers eye. Unstained pieces, retaining their original blue color, are called Hawk’s Eye. There are also pieces with both colors.

Sources

Australia; China; Namibia; South Africa; England, UK; United States.