Hello, yes, we often do this in jewelry design. Our jargon is "true color separation". When processing, we should consider how to weld gold of different colors simply and beautifully. There is also a process in which two kinds of gold can be welded without accidents (depending on the strength of welding), and there are also machines that specialize in making that kind of ring.

The above is my opinion, I hope I can help you. If it helps, please choose my best answer, and I will continue to answer your follow-up questions.