Plz help

Hi and welcome to forum :)

Make sure to turn gem confirmation option , but sadly it doesn't work in ancient world , maybe you lost your gems by mistake there

send a support ticket to sp about this , this is how asking to get your gems back
https://forums.socialpointgames.com/topic/80/how-to-report-game-problems-to-support

@Andressa When does this happen and how many disappear?