Currency
Coins are used in all three realms. Crystals are only used in the middle and higher realm.
[Coin currency]
10 Copper coins are equivalent to 1 silver coin.
10 silver coins are equivalent to 1 gold coin.
[Crystal currency]
10 silver crystals are equivalent to 1 red crystal.
10 red crystals are equivalent to 1 blue crystal.
10 blue crystal are equivalent to 1 violet crystal.
[Convert from coins to Crystal]
10 Gold coins are equivalent to 1 silver crystal.
CREATORS' THOUGHTS 
Osuoha
Osuoha I don't feel like doing the rest of the math so this is the currency for now.
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Weekly Power Status
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Ranking 
-- Power
stone