Gemstone

A gemstone, also known as an anguish gemstone, is the generic name given to the gems found in the Domain of Anguish in Guild Wars Nightfall. They drop rarely as loot from monsters in the Domain of Anguish and are given as reward for completing the Mallyx the Unyielding quest.

There are four different types of gemstones:
 * Margonite Gemstone
 * Stygian Gemstone
 * Titan Gemstone
 * Torment Gemstone

Uses

 * A set of one of each gemstone (a Gemset) can be traded for a Coffer of Whispers from the Keeper of Whispers in the Gate of Anguish.
 * 15 of each type of gemstone, 60 in total, can be traded for an Armbrace of Truth from a Spirit of Truth. The armbrace can be traded for a Tormented weapon from the Deacon of Whispers.

Trivia

 * One of each type of gemstone was formerly used to unlock the Ritualist hero, Razah during the quest Finding a Purpose.