You can trade a pearl with another magician in order to get a rune (this will remove 1 pearl from each player). You can only trade a pearl with the same magician once. Pearls serve no other purpose than to be traded in this fashion.
You'll find a detailed overview of your previous trades in your profile.
You can offer a pearl to another magician if you press the "offer trade" button in his profile. If he accepts the trade, each of you will lose one pearl and get a rune.
The other player won't get an automatic message from the offer, so you should send him a message if you offer him a trade.
Manage pearl exchange
You'll find the function manage pearl exchange in your profile.
It shows you:
- your recent pearl-exchanges
- pending offers
- your actual offer to another magician