In Aion Online, making Aion Kinah is a tough and crucial part. Gathering useless Manastones and turn them into expensive ones is a good way to make profit in the game.
You can use Alchemy skill, make lower grade Manastones into higher. The most sought stones, Critical Hit and Attack, are sold at high prices. However, the other manastones come at a very low price of Aion Kina.
Spend some Aion money to buy these cheap stones, and turn them randomly into attack and critical hit types of manastones using the Manastone Exchange Quests. Although, these come out to be low grade, you should turn them into higher grade stones and make some serious Aion Kinah from that.
When you are buying masses of these, then you have to exchange these by traveling to various zones which can be annoying. But once you overcome that you will see a lots of Aion gold.
By using this method, you need the Manastone NPC in Interdiktah. She turns your trash manastones into useful ones with 2 Manastone Quests at lvl 29. The first quest requires: +50 HP, +18 Accuracy, and +18 Shield Defense, and the second quest requires: +50MP, +10 Parry, and +18 Parry.
Many users don't even bother with manastones other than +2 attack and +10 Crit, so they are lying on the private stores or on the Brokers for 300-ish.
If you are working well with it, you are going to make about 1,680,000 Aion kinah. Good luck!