You are correct, it works like this. I had to throw away 50 crests to recover food and be able to leave it as it was. Once I did that, it let me do another progressive level up while keeping the gems as they were before. It is a double-edged sword. You have to be careful because you can lose resonance and your gems can become inactive. Although in the long run, when you recover that missing power, the resonance is fine. Thanks for your help. A hug.