Yellow Gem

"I can feel the magic in this."

- Maxwell The Yellow Gem is only found in Ruins. It is used to craft the Star Caller's Staff and the Magiluminescence.

Gathering
Yellow Gems are obtained by mining Ancient Statues, mining Broken Bits and Pieces of Stone, destroying Broken Clockworks, breaking certain Relics, and opening Ornate Chests.

Reign of Giants DLC
In the new DLC there will be an alternative method of getting Yellow Gems, by destroying Tumbleweed.