Here is how much you earn from each size range:

(Max allowed on Phones is 400 pieces/+34 coins)

+1 Coins (9-16 pieces)
+2 Coins (25-49 pieces)
+4 Coins (64-100 pieces)
+6 Coins (121-169 pieces)
+10 Coins (196-256 pieces)
+18 Coins (289-361 pieces)
+34 Coins (400-900 pieces)
+64 Coins (1024 pieces)

As always, if Support can answer any other questions please feel free to reach out to us!