amethystos, also Apoc., xxi, 20. This is the twelfth and last stone of the foundation of the New Jerusalem. It is the third stone in the third row of the rational, representing the tribe of Issachar (Ex., xxviii, 19; xxxix, 12); the Septuagint enumerates it among the riches of the King of Tyre (Ezech., xxviii, 13).