Abbott-Smith Manual Greek Lexicon
ἀμέθυστος (G271)
1 ἀμέθυστος , -ου, ἡ (acc. to Plut., ἀ- μεθύω , being regarded as an antidote against drunkenness), [in LXX: Ex 28:19 36:19 39:12 Ez 28:13 *;] amethyst , a purple quartz: Re 21:20 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain