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          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 o?= 1.544; e?= 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.

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