ἀμέθυστος G271
améthystos · am-eth'-oos-tos · Noun Feminine
from Α (as a negative particle) and a derivative of μεθύω; the "amethyst" (supposed to prevent intoxication):--amethyst.
1 Occurrence in the King James Bible
Revelation 21:20The fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.