Diamond

[Jewel]Can be used to enchant items, or sold to a merchant for gold.

[Usage]
Stormcry Gear
Daylight Accessories
Frostmetal Belt
Superior Brooches

[Source]
Alchemy - Jewel
Item level 435 or higher dungeons
Ghillieglade
Pit of Petrax
Guardian Legion Mission

Ace Medal · 2,000 Ace Medal · 2,200 Halloween Trick Box Kelsaik's Treasure Crate Guardian Legion Jewel Box Corsairs' Stronghold Victory Chest Fraywind Canyon Victory Chest GoldRushBox +64