I posted something on an official Sims Mobile forum grousing about how players never knew what the targets were for sticker to gem count. This was the relevant part of the reply from someone who seems to be knowledgeable but not a developer:
"The gems are earned as a percentile of all the stickers given out. Be in the top 10% for max gems. When the contests last longer than a week you’re looking at 8-10 per category, sometimes more. They can’t tell you what that requires, because until all the stickers are handed out they don’t know."
I need Stickers!
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Re: I need Stickers!
Strange that there's no sticker contest going. First time since I started playing.