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Raley Design Studios

Psilomelane Cabochon, 37.80 cts.

Psilomelane Cabochon, 37.80 cts.

Regular price $10.00
Regular price $18.00 Sale price $10.00
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Shipping calculated at checkout.

This material typically exhibits swirls and alternating layers of black Romanèchite and gray Pyrolusite, both of which are a manganese oxide and can achieve a submetallic lustre (almost mirror finish).  This stone appears to be mostly Pyrolusite and has a subtle botryoidal formation pattern when examined closely.  Flat, semi-polished back with a beveled edge for ease of setting.  You will receive the exact gemstone shown in photos.

Weight: 37.80 carats
Avg. Diameter: 22.8 mm
Height: 4.83 mm

Group: Hydrous Manganese Oxide
-Species: Pyrolusite-Romanèchite 
—Variety: -
Trade Name(s): Psilomelane, Black Hematite*
Origin: unknown
Enhancement(s): (N) Natural

* Using the term "black hematite" to describe Psilomelane is deceptive and a punishable crime under US Federal Trade Commission regulations. Hematite is an Iron oxide with a different chemical makeup.

American Gem Trade Association Gemstone Enhancement Codes

Enhancement: Any treatment process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability, or availability of a gemstone.

(N) Natural
No modification; natural stones which are not currently known to be enhanced (or currently has no known modification process).

Care Instructions


  • Take care to protect the gemstone when setting.
  • Avoid contact with abrasive materials, including polishes.  We have taken great care to bring out the brightest shine possible; using another abrasive may dull your gemstone's finished polish.
  • Avoid acids that could harm your gemstone, such as pickle.
  • Pearls should never be exposed to abrasives or chemicals.
  • Store gemstones in the pouch provided, or in a soft lined container away from other materials that may scratch or break gemstones; this includes other gemstones!


  • It's best to clean most gemstones with warm water and a mild dish soap.
  • Designate a soft toothbrush to use for cleaning.
  • Most gemstones should not be placed in an ultrasonic cleaner or in any jewelry cleaner containing chemicals.  The only gemstones that are generally safe in strong jewelry cleaners are strictly sapphires or diamonds.


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  • Questions?

    If you have any questions on the care or cleaning of your gemstone(s) purchased from us, please send an email to  We are happy to provide any additional information on your piece.