Diablo iii

Jeweler Perks and Benefits

Benefits Summary
Craft Amulets and Rings
Can craft gems
Remove gems from socketed items (without destroying either item)
Combine gems to improve their quality

Jeweler Recipes

From datamined info, there seems to be recipes for gem tiers 11 through 14. Meaning that for the highest level gems, you will need to find a recipe before your artisan has the ability to combine gems of the highest tiers.

Development History of Diablo 3

Blizzard Entertaiinment's been working on Diablo 3 since as early as 2000. Read about the progress that's been made developing the secret project that the former Blizzard North division has been working on since the release of Lord of Destruction.