Smoky Quartz Value, Price, and Jewelry Information

Smokey Quartz

Smoky Quartz

Smoky Quartz Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Quartz Value via Gem Price Guide

Smoky Quartz All sizes
Faceted to /ct
Rose Quartz All sizes
Faceted to /ct
Rutilated & Tourmalinated Quartz All sizes
Faceted to /ct
Cabochons /ct
Quartz with Lepidocrite All sizes
Faceted or cabochon to /ct
Star Quartz All sizes
to /ct

Smoky Quartz Information

Data Value
Name Smoky Quartz
Is a Variety of Quartz
Varieties Morion
Crystallography Hexagonal.
Refractive Index 1.544-1.553
Colors Every shade of brown.
Hardness 7
Wearability Very Good
Fracture Conchoidal to uneven
Birefringence 0.009
Cleavage None or indistinct
Dispersion 0.013
Absorption Spectrum Not diagnostic.
Pleochroism Dark stones: weak brown/reddish brown. Light stones: weak, light and darker yellowish brown.
Optics = 1.544; = 1.553 (very constant). Uniaxial (+).
Optic Sign Uniaxial +
Luster Vitreous.
Polish Luster Vitreous.
Fracture Luster Vitreous.
Specific Gravity 2.651
Enhancements Heating (occasional).
Typical Treatments Heat Treatment
Transparency Transparent to opaque.

Comments

Smoky quartz is also mistaken for topaz. It comes in every shade of brown, from a light tan to nearly black. “Chocolate citrine” is a pleasant brownish/yellow color. Smoky quartz is known for its large sizes. The person who wants a really big gem, without a really big budget, often ends up with one of these.

Sources

  • Cairngorm Mountains, Scotland.
  • Minas Gerais, Brazil; Madagascar; Switzerland.
  • United States: California; North Carolina.

Stone Sizes

Smoky quartz: is in the same size league as citrine, but larger stones get very dark and opaque. Smithsonian Institution (Washington, D.C): 4500 (California) and 1695 (Brazil), plus others.