If you're talking about five and six star champions, rank up gems are available as prizes in certain content however rank down gems are not a thing outside of those Mole Man level fixes that make a significant change to the kit greatly decreasing their value to the community at Large.
However you're talking about four star and under, we should be receiving that fill in the gap feature shortly to help rank up much faster.
kabam already stated that they will no give rank down gems, which i'm agree too unless there is nerf case, while rank up you need to do some content for it
this is not for free, you need to do something to earn it
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However you're talking about four star and under, we should be receiving that fill in the gap feature shortly to help rank up much faster.
this is not for free, you need to do something to earn it