The meaning of Amethyst in the Bible
(From Easton's Bible Dictionary)

one of the precious stones in the breastplate of the high priest (Exodus 28:19; 39:12), and in the foundation of the New Jerusalem (Revelation 21:20). The ancients thought that this stone had the power of dispelling drunkenness in all who wore or touched it, and hence its Greek name formed from a_, "privative," and _methuo , "to get drunk." Its Jewish name, ahlamah' , was derived by the rabbins from the Hebrew word halam , "to dream," from its supposed power of causing the wearer to dream.

See more on the meaning of Amethyst in the Bible:
Amethyst {International Standard Bible Encyclopedia}

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