A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Author: Kyria d'Oreyn
Unless stated otherwise, all information herein is taken from Knife of Dreams, Chapter 20.
He is known throughout the Borderlands for his flawless stones, but he trades other things as well.
He trades gems with two Illianer merchants before Nynaeve appears. He was pointed out to her as a merchant with wide correspondence by pigeon, which she wants to use to send out a message concerning Lan riding for Tarmon Gai'don. He will send the message, however many pigeons it requires, since he is no fool to break a word he gives an Aes Sedai, and he pledges to ride with Lan toward Tarwin's Gap.
"No one shouted at a man who wore the hadori and a sword, as Aldragoran did, and they tried to avoid making him sweat. Such men carried a reputation for sudden, unpredictable violence. If he had seldom been forced to use the sword at his hip, it was widely known that he could and would." (Aldragoran on Malkieri; Knife of Dreams, Chapter 20)