Board Thread:General Discussion/@comment-17484863-20150122035945/@comment-11879879-20150905090157

SOLUTION: 

Send a ticket to developer (meaning go to game's help page; go to the last option; answer NO to "This solved your question?" and fill the form that will appear after that. Your FB's ID will be automatically added if you did not logged out FB -> Must be this way to get response from SP).

Happened the same to me few months ago with more than 300 gems. I've did exactly as described and in a very POLITE way explained that was a accidental clik and asked for revert that and return the gems to me. 2 days after, the gems was restored BEFORE the mail informing about that will be delivered. By the way, it's not a must send that ticket on the same FB's session of the gems' accident; what it matters is to be logged into the same account affected while sending the ticket.