sardonyx
Noun
Meaning
A variety of onyx consisting of sard and white chalcedony in alternate layers.
Source: Webster's dictionarySynonyms
ruby
garnet
jade
topaz
sapphire
beryl
diamond
agate
amethyst
hyacinth
onyx
zircon
heliotrope
carbuncle
plasma
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Antonyms
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Examples
Agate is a frequent material, especially carnelian or banded agate like sardonyx ; the banding makes the impression contrast with the ground.
Holland, pp. 294–295; Southern, p. 108 The Blacas Cameo showing Augustus wearing a gorgoneion on a three layered sardonyx cameo, AD 20–50 Soon after his bout of illness subsided, Augustus gave up his annual consulship.