Soldering gold filled jump rings

There are a couple of considerations here. Gold Fill is a heavy layer of gold over a base metal. You have to be careful about overheating, polishing and some of the plating processes.
Since you are spending the $ on gold fill, you probably don’t want to use the soft soldering methods because of color and quality. This puts you into the ‘hard’ soldering methods. Y can get 10-carat Low temp gold solder that works well. There are also some brazing solders which look pretty good. You may want to tumble polish with steel shot rather then buffing. Buffing runs the risk of polishing off the gold layer. Frequently jewelers plate after soldering gold fill to match up the colors – you need to not use the stripper type plating methods as , once again, they may damage the gold fill layer.
Overall, this will involve you more in the metalsmithing and jewelrysmithing aspects of our craft.
I would recommend the Tim McCreight book 'The Complete Metalsmith' for your growing studio either way. The R&T cat # is 62-010.
If you read up these links , they will fill in additional details regarding 'hard' & 'soft' soldering
http://www.rings-things.com/cgi-bin....ldering
http://www.rings-things.com/cgi-bin....ldering ':cool:'

you might also use the search function for more discussions regarding soldering