You can become a Jeweler at level 3, all you need to do is a small quest for your respective Jeweler, whom you can find at the Guild House at City Square. You will be asked to go and kill a Krogan  until they drop a Necklace, once you have the necklace you go back to the Jeweler and obtain your new Secondary Profession. Normally Jeweler is paired with Geologist Profession.
Now, a Jeweler have loads, and I mean LOADS, of recipes they can learn so to make things a bit easier let start with just the recipes for normal all day stuff. Most recipes can be bought from the Jeweler Shop but some can not and they are marked as to where those can be obtained.
|Require possession of the Eldorill Dust recipe and to have learned Treatise On Rare Minerals I|
And to make things even easier there has been 3 separate pages made for each fighting style and what Runes and Elements those can use to improve their Armour. Can either use the links in the sidebar or click directly on one of the below links.
|Bonecrusher Runes||Dodger Runes||Heavyweight Runes|