Things of Middle-earth
Meaning: People of the Jewel-smiths
Description:'Sauron used all his arts upon Celebrimbor and his fellow-smiths, who had formed a society or brotherhood, very powerful in Eregion, the Gwaith-i-Mírdain; but he worked in secret, unknown to Galadriel and Celeborn. Before long Sauron had the Gwaith-i-Mírdain under his influence, for at first they had great profit from his instruction in secret matters of their craft. So great became his hold on the Mírdain that at length he persuaded them to revolt against Galadriel and Celeborn and to seize power in Eregion; and that was at some time between 1350 and 1400 of the Second Age....
At last the attackers broke into Eregion with ruin and devastation, and captured the chief object of Sauron's assault, the House of the Mírdain, where were their smithies and their treasures. Celebrimbor, desperate, himself withstood Sauron on the steps of the great door of the Mírdain; but he was grappled and taken captive, and the House was ransacked.'
Unfinished Tales, Part 2, Ch IV, The History of Galadriel and Celeborn
'In Eregion the craftsmen of the Gwaith-i-Mírdain, the People of the Jewel-smiths, surpassed in cunning all that have ever wrought, save only Fëanor himself; and indeed greatest in skill among them was Celebrimbor, son of Curufin, ...'
The Silmarillion, Of the Rings of Power and the Third Age
Contributors: Lyllyn 7.11.03