Originally Posted by Zandel

Jewelry is worth collecting for Whale Ship and the like, you need to outfit 40 girls for that and while you don;t need it for this first mission others will be harder and then you will. At some point you will need 80 lvl 70 girls with as much equip as you can fit on them.

And gladly, the jewelry cap just got raised (though I think it should be at 1,000 pieces).