Things You'll Need
Instructions
Travel to Randol, and talk to the merchant, Geres. He will be selling a variety of boxes.
Buy one of the boxes from Geres. The more expensive the box, the greater chance that your combining will be successful. Additionally, you must spend a set amount of gold each time you use the box.
Select the box in your inventory to use it. The box will take three moonstones from your inventory and attempt to combine them to make a better moonstone. If successful, you will receive the new, better moonstone and will have a set amount of gold deducted from your account.