Jeweling question[s]

Because I'm derp and didn't think to ask sooner, apologies for another goddamn thread:
Is there a failure rate in making accessories?
-Is there % chance of break on failure?
-If I want to craft an equip way lower than the reccommended profession level, is there a set % fail rate that changes on level difference, or is it "you're going to fail at this rate till you get to that level"

Plus, the new shoulderpads can't be pot'd right?

There's a set failure rate for each level below the item you try to craft. So if you try to craft a level 7 item, using level 1 jewelry, you'll fail most of the time. When you fail, you just don't get anything.

It does decrease every time you level up.
For example
+1: 84% success
+2: 65%
+3: 51%

It tells you in game what the failure rate is.