When you see the 1st platform with spikes and a bounce pad, jump on it and lean LEFT not right. If you lean and jump left, you will surely miss it. So jump to the left, and keep going. Eventually you will find it.
in molekin mine (you need to shoot some crystals to get it)
GET soul gem and unlock the soul gems upgrade
Dragons peak
You find it on Cadavourus Crypt
you find the soul gem in darkwater cove but i dont know the exact place in the level
Chop Chop or Flameslinger
dark light krypt
in the level empire of ice but you have to buy it
Sorry I don't know but I know where Sunburns soul gem is it is in Dragon's Peak about 5 minutes into it lean of the island and there is a dragon waiting there to take u to his soul gem
get empire of ice and start looking
in the empire of ice, but i didn't collect it. it's hidden somewhere!
Sonic boom can make little baby minions he is better
If you buy Pirate Seas, the soul gem is something with a cannon. I'm not sure where it is, but it is definitely in Pirate Seas. If you go by the cannon on land go right up the stairs and you will find the soul gem.