The second jewel in the walls of the new Jerusalem (Rev. 21: 19); and in Ezekiel's vision the heavenly throne resembled sapphire (Ezek. 1: 26).
Citation for sapphire
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"sapphire." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 19, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1678>.
Chicago
"sapphire." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1678 (accessed May 19, 2013).