Originally Posted by
fatbearsecondary
This is a common misunderstanding with cruise event prizes. The final prize, Sesi, comes to your restaurant forever. She is not a quick reward where you instantly get a bunch of gems. She is a slow, constant source of gems. You're not mean to be making the cake and getting gem rewards every 12 hours or every day. But you get to make several a week, forever. That means you get a constant source of gems for as long as you play the game... and there is no constant source of gems in the game, other than the cruise visitors. This is the ONLY way to earn gems indefinitely.
If you're unsatisfied with that, then that's one thing. You can decide that you don't want to try to finish cruises in the future. But that's the way all of these have worked so far - a slow but steady source, such that I'm not surprised you haven't made one 12 hours after completing the event. So you can decide if that's something you want to pursue in the future.