Black Onyx Value, Price, and Jewelry Information


Onyx
"Onyx" by Simon Eugster --Simon 14:41, 11 April 2006 (UTC) - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons.

Black Onyx Value

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

Black Onyx Information

DataValue
NameBlack Onyx
Is a Variety ofChalcedony
VarietiesSardonyx
Crystallography Hexagonal, microcrystaline.
Refractive Index 1.544 - 1.553
Hardness 7
Specific Gravity 2.651
Cleavage None
Heat SensitivityNo
Wearability Excellent
Enhancements Dying, common
Special Care InstructionsNone
FormulaSiO2

Onyx is banded chalcedony that is found in many different colors including commonly black and white.