What defines 'Rarity' for charms?

DRAGOON
Member Posts: 126
Why is a charm that's on tier 49 considered common yet a charm on tier 7 uncommon? Same goes for the Pestula flower charm, its a premium one that's considered very rare, yet I've seen them in every single game for survivor and killer.
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Comments
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I'm pretty sure it's defined mainly by how long it took to make or how cool the devs thought it looked.
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can any devs chime in?
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A dartboard.
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