Board Thread:Questions and Answers/@comment-28167674-20160513095027/@comment-10336-20160929111459

It is certainly more often then 1 per 5, since no island has 25 chapters, 15 is max. It is more like 1 gem every 2-3 chapters, but would be nice to verify which chapters. For those who are completing story islands, please try to pay attention to when you get a gem and update the pages.