Scrooge and Launchpad seem to be really bad for this event. I have had better luck with half a dozen different emojis, even with the doubling. And, while I have enough gems to chancew a diamond box, I have slightly less than 50/50 odds of getting something new, and my track record on those is that I have always gotten emojis that I already have. (Sample size is small, but the odds of getting nothing new in something like 5 or 6 tries is now down to about 2-3%.)