Talk:Ensemble Stars! Master Guide/@comment-25148607-20150805233121

I've been playing this game for about 10 days, and I pulled 5* Yuta and 4* Izumi from the event gacha a few days ago. I used all my saved-up gems on their Idol Roads to the point where it prompted me to use diamonds. So to complete Idol Roads I need to have star-shaped gems (large gems?). How do I get those? I've played the weekly missions and only received square (medium?) and triangle (small?) gems, and the only time I've received large gems were during a producing session (only once, though).

Is there an easy way to get large/star shaped gems? Is it just luck? Or do I need to unlock abilities which increase the rate of gems dropping?

Thank you~