| stygian(adjective, obscure, dark, gloomy, pitch) | |
| swart(adjective, obscure, dark, gloomy, pitch) | |
| topaz(noun, gem) | |
| zircon(noun, jewelry, gem) | |
| alexandrite | |
| aquamarine(noun, gem) | |
| black | |
| brilliant | |
| coral(noun, gem) | |
| dingy(adjective, black) | |
| gem(noun, gem) | |
| gemstone | |
| girasol | |
| hard stone | |
| hematite | |
| jacinth | |
| jasper | |
| livid(adjective, black) | |
| murky(adjective, black) | |
| pitch-dark pitchy(expression, adjective, dark, black, murky) |
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| APA | Smart Define. (2015). onyx thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/onyx/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "onyx thesaurus" https://smartdefine.org/onyx/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, onyx thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/onyx/thesaurus/synonyms>. |
| MLA | Smart Define. "onyx thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/onyx/thesaurus/synonyms> |