Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Cats Eye Emerald

NPC	Level	Zone	Chance
Venture Co. Enforcer	16 - 17	The Barrens	5.00%
Venture Co. Overseer	17 - 18	The Barrens	5.00%
Boss Copperplug	19	The Barrens	5.00%