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    1. Cinnabar Value, Price, and Jewelry Information

      “Cinnabar,” Lovelock, Pershing Co., Nevada, USA. ? Rob Lavinsky, www.iRocks.com. Used with permission.

      Cinnabar

      Magnificent red cinnabar is extremely soft and fragile, so faceted material is rare. It’s cut primarily for collectors and carvings.

      Cinnabar Value

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

      Cinnabar Value via Gem Price Guide

      Accompanying value information:
      Cabochons All sizes
      to /ct

      Cinnabar Information

      Data Value
      Name Cinnabar
      Colors Scarlet red, brownish red, brown, black, gray.
      Crystallography Hexagonal. Usually massive, fine grained; crystals are prismatic or rhombohedral and characteristically twinned, especially those from China.
      Refractive Index 2.905-3.256
      Luster Adamantine to submetallic; massive varieties dull, earthy.
      Hardness 2 - 2.5
      Wearability Poor
      Fracture Fracture conchoidal to uneven
      Specific Gravity 8.09
      Birefringence 0.351 (very large).
      Cleavage Perfect 1 direction
      Dispersion Over 0.40.
      Luminescence None.
      Luminescence Present No
      Transparency Transparent crystals, rare. Translucent to opaque.
      Absorption Spectrum Not diagnostic.
      Formula

      HgS

      Optics

      o = 2.905; e = 3.256. Uniaxial (+).

      Optic Sign Uniaxial +
      Etymology

      Unknown, possibly from Sanskrit.

      Occurrence

      Cinnabar is a mineral of low temperature ore deposits; also in veins, igneous rocks, and around hot springs. Crystals are very rare.

      cinnabar - Charcas Mexico

      Cinnabar: Charcas, Mexico (1.37). Photo ? Joel E. Arem, PhD, FGA. Used with permission.

      Comments

      Cinnabar carvings from China appear regularly on the market but aren’t abundant. Be advised that people have used this material to make a red pigment since antiquity. Some so-called “cinnabar carvings” you may find are actually wood pieces painted with cinnabar lacquer.

      Chicken blood stone’s red color is due to the presence of cinnabar. Jadeite may also contain traces of this mineral.

      Although commonly associated with the color red, specimens may range from brown to gray and even black.

      cinnabar - lacquer beads

      “Cinnabar Beads,” carved lacquer beads, by Pschemp. Licensed under CC By-SA 3.0.

      Sources

      Hunan Province, China yields the world’s finest crystals. Crystalline cinnabar is very rare.

      Other notable sources include:

      cinnabar - China

      “Cinnabar on Dolomite,” Tongren Mine, Tongren, Guizhou, China. ? Rob Lavinsky, www.iRocks.com. Used with permission.

      Stone Sizes

      Cut specimens are extremely small, normally less than 3 carats. Some rough exists that might cut up to 50 carats. Fine transparent Chinese crystals are unlikely to be cut, since they’re extremely valuable as mineral specimens.

      Gem cutters can make cabochons up to several inches in size from massive cinnabar.

      cinnabar - needles

      “Cinnabar,” Culver-Baer Mine, North Fork Little Sulfur Creek, Sonoma Co., California, USA. Crystal needles in matrix. ? Rob Lavinsky, www.iRocks.com. Used with permission.

      Care

      Cinnabar contains mercury. Avoid inhaling dust or fumes and wash your hands after working with this material, especially massive specimens. See the Agency for Toxic Substances and Disease Registry profile on mercury for more information.

      Since cinnabars have a hardness of 2, store any jewelry separately from other stones to avoid contact scratches. Clean only with a soft brush, mild detergent, and warm water. Consult our gemstone jewelry cleaning guide for more recommendations.

      cinnabar - pendant

      “Dim Sum Necklace – Front Detail,” hand-carved cinnabar pendant with jade disc, by Christopher, Tania, and Isabelle Luna. Licensed under CC By 2.0.

      by Joel E. Arem, Ph.D., FGA

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