Wheres the Gems?

I have been playing this game since it first came out and must I really like it except for one very frustrating item. Whenever there is a challenge involving collecting gems it seems you never have a chance to get any. Take today for example. The daily challenge is collect 4 gems. I have played on off today and have probably played for 90 minutes all totaled together and have ONE gem. I dont mind a challenge but be realistic!

Joe in MI about Temple Run 2, v1.34.2