Literary authors have long employed “onyx” as a richly evocative color that goes beyond mere description of a stone. In some works the term is used to conjure qualities of deep darkness or shifting hues—as when a “piece of black onyx” serves to emphasize the austere beauty of an object ([1]), or when a rare onyx in “black and yellow” is celebrated for its striking contrast ([2]). Onyx also appears in more poetic registers, with descriptions of “a fine piece of onyx” suggesting a lustrous, almost liquid quality ([3]), or in imagery where “little steps of onyx” evoke an elegant, continuous visual rhythm ([4]). Authors have even specified hues by reference, as in “red onyx” that adds passionate vibrancy ([5]) and “yellowish onyx vases” that underscore warmth ([6]), while other passages invoke a more mystical tone—describing a “burnt onyx” that recalls transformation ([7]) or a star “one mass of onyx” that radiates enigmatic light ([8]). Finally, some texts remind us of the stone’s versatile palette, noting that onyx naturally appears in an array of colors from translucent old gold to deep black ([9]).