The green precious stone which was one of twelve on the high priest's breast-piece (Exod. 28: 20), and in Rev. 21: 20 the mineral beryl forms the eighth of the foundation stones of the wall of the New Jerusalem.
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"beryl." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Jan 16, 2017. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e261>.
"beryl." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e261 (accessed Jan 16, 2017).