Gemstone Axe

Acquisition

 * Core
 * Isle of the Nameless
 * Zaishen Chest

Factions Nightfall Drop research is ongoing, and can be found here.
 * Minister Cho's Estate
 * Sickened Guard
 * Raisu Palace (explorable area)
 * Forbidden Chests
 * Random drop (hard mode)
 * Vabbi
 * Vabbian Chests
 * Treasure
 * Random drop

Dye
Dye affects the axe's handle and the gems on the axe's head. The default color can be closely replicated using yellow dye.