You can solder stainless steel to gold using gold or silver solder.
I would recommend using gold easy solder or medium silver solder.
Use black flux designed for silver soldering stainless steel (you
can get it at the local welding supplier) be careful not to overheat
the stainless or it will oxidize and the solder will not stick. Also
be careful of the fumes from the flux. With a little practice you
should not have any problems. Frank Goss