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
Colors Black, white (banded)
Fracture Conchoidal
Hardness 7
Specific Gravity 2.651
Birefringence 0.009
Cleavage None
Dispersion None.
Heat SensitivityNo
Wearability Excellent
Enhancements Dying, common
Special Care InstructionsNone
Transparency Opaque.
FormulaSiO2
Pleochroism None.
Optics Uniaxial (+).

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