Old Horapollo himself weighed it a third time, with a keen eye though his hands trembled a little; all three experiments gave the same result: this gem was heavier by a few grains of doura than that which the merchant's son had weighed, and yet the Jew declared that there was no purer, clearer, or finer emerald in the world than this.
"The Complete Historical Romances of Georg Ebers"
Georg Ebers