Talk:Prisma Codes Collaboration Event (US)/@comment-26359208-20180829093318/@comment-34364075-20180829123522

You can also farm them during half AP free quests.

Fuyuki, Orleans, and Septem should be a good source for those blue gems. Your fingers might bleed a little though. But hey, if you farm Fuyuki you can also get bones at the same time.