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. It is a pale-blue crystallized quartz, varying to a dark purple blue. It is found in Persia and India, also in different parts of Europe.
Source
- part_of
source-manifest/easton— Easton's Bible Dictionary (PD)