Quote Originally Posted by Mayclore View Post
I never did that. I used gems to double shares, which immediately went into the key drop and private show spawn reduction decorations. More shows equals more keys, which mean more chances to get gem drops. I then used excess gems to buy guaranteed multipliers from the shop if I felt I needed them, which wasn't often. If I got a multiplier from the free spin, then great. If not, I never spent gems to try and gamble for one.
Interesting, thanks!

I am yet not getting any gem drops because I use almost no keys. I am only level 14 and waiting for the legendary chest to unlock, with 900 keys saved.

I presume I should spend them all immediately as soon as I unlock the last chest?