8
emerald(noun, jewelry, gem)
7
pitchy(adjective, pitch, black, murky, somber)
6
agate(noun, jewelry, gem)
6
diamond(noun, jewelry, gem)
5
chalcedony(noun, jewelry, gem)
5
amethyst(noun, jewelry, gem)
5
bloodstone(noun, jewelry, gem)
5
carbuncle(noun, jewelry, gem)
5
ebon(adjective, obscure, dark, gloomy, pitch)
5
inky(adjective, black, colors)
5
pitch-black(adjective, dark, pitch, black, murky)
5
ruby(noun, jewelry, gem)
4
beryl(noun, jewelry, gem)
4
hyacinth(noun, jewelry, gem)
4
pitch-dark(adjective, obscure, dark, gloomy, pitch)
4
sable(adjective, black, colors)
3
sapphire(noun, jewelry, gem)
3
charcoal(adjective, obscure, dark, gloomy, pitch)
3
garnet(noun, jewelry, gem)
3
jade(noun, gem)
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APASmart Define. (2015). onyx thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/onyx/thesaurus/synonyms
ChicagoSmart Define. 2015. "onyx thesaurus" https://smartdefine.org/onyx/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, onyx thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/onyx/thesaurus/synonyms>.
MLASmart Define. "onyx thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/onyx/thesaurus/synonyms>