I happen to be a pro welder. IMHO, a guy that is good with TIG is the way to go. Some jewelry places have lasers nowadays. You'd be amazed how much BS is out there about welding, especially when it comes to castings. I've been doing it since 1992, with formal training back then. Very likely you'll want to anneal it regardless of the material and process. Guaranteed that it will need re-finishing to blend back in with the rest of the piece.
You could also use silver solder in paste form, making alignment much easier and more accurate, but for sure the solder wouldn't take any bluing or other finish. The repair would remain visible forever.
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