サードニックス

also: サードニクス

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Meanings

1

sardonyx

A variety of onyx with alternating bands of sard and white chalcedony; used as a gemstone.

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Sardonyx has been used for seals and cameos since ancient times.

オニキス
Onyx is a broader term for banded chalcedony; sardonyx specifically has bands of sard (reddish-brown) and white.
メノウ
Agate is a general term for banded chalcedony; sardonyx is a type of agate with distinct red and white bands.

Loanword from English 'sardonyx', ultimately from Latin 'sardonyx' and Greek 'sardonyx'.