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Black Onyx Gemstone Information
Information * Loose gemstones * Jewelry links

Onyx has been linked to lovers by causing discord and cooling the fires of passion. It was thought that onyx carved with Mars, the God of war, gave Roman soldiers courage. It was also once believed that dark onyx caused bad dreams and sad thoughts.
 

ENHANCEMENT CODE D
Click to view AGTA code.

PROPERTIES
Refractive Index 1.535-1.539
Hardness = 6.5-7 (Moh's Scale)
Specific Gravity =2.60
Species - Chalcedony
Optic Character - Aggregate.


WARNINGS FOR CARE

Ultrasonic: Safe
Steamer: Safe
Heat: Fair; color change may occur with heat
Chemicals that harm: Hydrofluoric acid, nitric acid

 

Crystal Structure

Black onyx crystal image.

Crystal system: Hexagonal fibrous aggregates, micro crystalline quartz

MAJOR SOURCES
Brazil, Madagascar,
Uruguay, US
Birthstones
 January  Garnet
February Amethyst
March Aquamarine
April Diamond
May Emerald
June Pearl/Alexandrite
July Ruby
August Peridot
September Sapphire
October Opal/Tourmaline
November Topaz or Citrine
December Blue Topaz or Zircon
Common Cut Examples.


Antique.
Faceted.
Square, buff top
 


Antique Cushion.
Faceted cut.
Buff top.
 


Heart Shapes.
Faceted cut.
Cabochons.


Marquise.
Faceted cut.
Buff top.
Cabochons.


Octagon.
Faceted cut.


Oval shape.
Faceted cut.
Buff top.
Cabochons.
 


Pear Shape.
Faceted cut.
Cabochons.


Round Cuts.
Faceted cut.
Cabochons.


 

 
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Prices in US Dollars subject to change without notice.