With the release of the second island, we've gained the ability to trade in a few star quartz! You trade them in to Fat Chocobos throughout the world for various items. Currently we only have one to trade to, and he's hiding in the Lost Village of Marlo! If you don't have that unlocked, here's another guide I wrote showing you how to get there. http://brave-exvius.com/threads/unlocking-lost-village-of-marlo.444/ This birdy isn't the easiest guy to find either! Once you enter the village, goto the left along the tree line until you're here. You'll find a hidden path leading down, to an area with a ladder, follow that ladder up and you'll find our birdy! He currently doesn't have a lot worth trading for. Looking through http://altema.jp/ffbe/debuchokobo-1860 , along with some jp version players advice, I would recommend saving them until later when we can buy an earring that gives Defense +3, Magic + 20% for 50 star quartz. How you choose to spend is up to you tho!