| shadowy(adjective, black) | |
| silvered(heather, charcoal, starless) | |
| silvery(heather, charcoal, starless) | |
| slater(adjective, dark, pitch, inky, clouded) | |
| spinel | |
| spinelle | |
| stoner(heather, charcoal, starless) | |
| sunstone | |
| swarthy(adjective, black) | |
| synthetic | |
| synthetic ruby(expression, idiom, jewelry) | |
| tourmaline | |
| turquois | |
| unclean | |
| variety of chalcedony(expression, idiom) | |
| baguette |
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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> |