Disclaimer: This is NOT an official preview, this is mostly the result of datamining and it might not reflect what will be in the final game.
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:
Amesthyst - Helm
Chipped Amethyst - 5% Life
Flawed Amethyst - 6% Life
Amethyst - 7% Life
Flawless Amethyst - 8% Life
Perfect Amethyst - 9% Life
Radiant Amethyst - 10% Life
Square Amethyst - 11% Life
Flawless Square Amethyst - 12% Life
Perfect Square Amethyst - 13% Life
Radiant Square Amethyst - 14% Life
Star Amethyst - 15% Life
Flawless Star Amethyst - 16% Life
Perfect Star Amethyst - 17% Life
Radiant Star Amethyst - 18% Life
Amethyst - Other
Chipped Amethyst - +6 Vitality
Flawed Amethyst - +10 Vitality
Amethyst - +14 Vitality
Flawless Amethyst - +18 Vitality
Perfect Amethyst - +22 Vitality
Radiant Amethyst - +26 Vitality
Square Amethyst - +30 Vitality
Flawless Square Amethyst - +34 Vitality
Perfect Square Amethyst - +38 Vitality
Radiant Square Amethyst - +42 Vitality
Star Amethyst - +46 Vitality
Flawless Star Amethyst - +50 Vitality
Perfect Star Amethyst - +54 Vitality
Radiant Star Amethyst - +58 Vitality
Emerald - Helm
Chipped Emerald - 5% Better Chance of Finding Magical Items
Flawed Emerald - 7% Better Chance of Finding Magical Items
Emerald - 9% Better Chance of Finding Magical Items
Flawless Emerald - 11% Better Chance of Finding Magical Items
Perfect Emerald - 13% Better Chance of Finding Magical Items
Radiant Emerald - 15% Better Chance of Finding Magical Items
Square Emerald - 17% Better Chance of Finding Magical Items
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