Diamond

Diamonds are a rare crafting material introduced in Guild Wars Nightfall.

Use
Diamonds are used in making Destroyer Weapons.

Acquisition

 * Can be obtained by trading 7 Trade Contracts with a Vabbi Trade Official in The Kodash Bazaar.
 * Can be found in high-end Treasure chests.
 * Can be found in Hidden Treasure chests in Eye of the North by using Light of Deldrimor.
 * Can be salvaged out of some Elonian drops. see "what salvages from" below.
 * The Coffer of Whispers has been known to sometimes give 5 Diamonds.
 * Dungeon reward chests in Eye of the North.
 * Reward for quest Attack on Jalis's Camp in Eye of the North.
 * Can very rarely be dropped from every creature that can drop crafting materials, most commonly in the Underworld, and the Fissure of Woe.

What it salvages from

 * Jeweled Daggers
 * Diamond Aegis
 * Diamond Djinn Essence
 * Geode
 * Iridescent Aegis

Trivia

 * Until the release of Guild Wars Eye of the North, they had no use at all.