Not knowing what was offered, and even so,,,I think that it is hard to say because every "market" is different. The cost of living is different everywhere and everyone's circumstances and experience is different. you have people from several countries who are reading this... so it would be impossible to give you a quote.
You just have to decide if the rate, regardless of what the job is doing is satisfactory to you. forget that its doing jewelry and just imagine it as an office job etc...would you go to work for $5 an hour $10? $20? Piece rate? or would you press the snooze button? would it be enough to fill up the gas tank, buy whatever you needed to do the job (tools? lunch? clothes?), and have something for your efforts.
If you have another income otherwise and are doing on the side for the love of it, the experience, or hopes in turning into something bigger, it would be assessed differently as if this would be your bread and butter. Not that i think people should work for nothing just because they have another source of income, but if you have the opportunity to get the experience that you want, sometimes the opportunity trumps the actual pay rate, esp if you are learning a new skill or it will open a door somewhere higher down the line. Especially if you have never worked in that capacity (doing jewelry repair before).
who knows, maybe once you are there, you can negotiate a percentage of the selling price...just a thought...depending on what level of merchandise they sell of course..
sorry i am absolutely no help.,,and believe me i did many jobs that i loved and got very little and made buckets of money on things i merely tolerated... I do believe in taking risks and doing what you love, but sometimes people know that and know you are willing to take very little money for "love." so just honestly think about what you want, be fair to yourself but don't price yourself completely out of the job either unless you have the experience in the craft to back it up.