The Jeweler is upgradable and can be found in town, just like the Blacksmith on the beta. He offers 3 different types of services:
- He will combine 3 identical gems to create a new higher quality gem.
- He will remove gems from an item, returning both the item and gems to you intact.
- He can also add a socket to an item.
Obviously, adding a socket and removing gems from an items will cost you money but combining gems should be free.
The average amount of sockets on a high level item is around 2-3 depending on the item type but a couple of helms, shields, or weapons seem to have up to 4 possible sockets according to the game files.
Also, a lot of gems are already in the game files and it seems to be a good time to list them