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@grimlockdown
@craftymitts I have some info.
1 pig = 100 coins (in Spark Run)
1 legendary (yellow) crystal ≈ 175 gems (162 if you are upgrading accessories / 187 if you are upgrading TFs)
1 epic (purple) crystal ≈ 50 gems
1 rare (green) crystal ≈ 15 gems
1 uncommon (blue) crystal ≈ 5 gems
1 common (white) crystal ≈ 1 gem
2 tokens = 1 gem (in Token Exchange)
1 token = 10–25 coins
From these you can deduce that one gem would be 20–50 coins, so
10 gem = 500 coins = 5 pigs (chain of fantasy reasoning)
Edit: Corrected pig to coin ratio