Topaz - Vine's Expository Dictionary of New Testament Words
Topaz
[ 1,,G5116, topazion ]is mentioned in Revelation 21:20, as the ninth of the foundation stones of the wall of the heavenly Jerusalem; the stone is of a yellow color (though there are topazes of other colors) and is almost as hard as the diamond. It has the power of double refraction, and when heated or rubbed becomes electric. In the Sept., Exodus 28:17; Exodus 39:10; Job 28:19; Psalms 119:127, (gold and) topaz;" Ezekiel 28:13.