GEMSTONE ENCYCLOPEDIA
Onyx
A variety of chalcedony often used in black or black-and-white jewellery; dyed material should be disclosed.
ColourBlack and banded colours
Mohs hardness6.5–7
Mineral familyChalcedony
BirthstoneNot listed
What is Onyx?
A variety of chalcedony often used in black or black-and-white jewellery; dyed material should be disclosed.
Colour and appearance
Black and banded colours
Traditional meaning and symbolism
Long used in jewellery and decorative objects
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Traditional meanings are cultural associations, not proven medical benefits.