Board Thread:Questions and Answers/@comment-202.80.217.213-20150104232338/@comment-25889587-20150105013448

Coins and Crystals are not transferrable between platform. They stay on either the iOS version or Android version, which means what was collected on iOS will not be present in the Android version, and vice versa. You can simply login on iOS and you'll get your crystals back. Just spend it if you want to fully use Android in the future.