As I said my brother is new to EU so ill try to find someone there, I dont want to sell those jewelry I either want to collateral them and get them back when I pay the loan, does a pawnshop works like that in germany?
Lending you money in exchange for a collateral is the real function of pawnshop. This actually what you are looking for instead of asking a loan here and spen shipping fee more than the value of your jewelry.
Your best chance is to find trusted guy here that you can meet IRL near your location and interested to the jewelry you are offering. Some pawnshops charge an incredible interest rate so make sure to read carefully the terms.