Goggles of Gem Hunting

The Goggles of Gem Hunting are used to detect sunken treasure and gems off the coast of the Arathi Highlands.

Source
This item is provided when you receive the quest Sunken Treasure (2) which starts with Doctor Draxlegauge in Faldir's Cove in the Arathi Highlands. This item is turned back when when you complete the quest.

As a quest objective

 * Sunken Treasure (2)