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Solder platinum mount to gold ring

I am considering buying a vintage ring to recycle the marquise diamond with a platinum mount into a 14K gold ring of my design. In the archives I have found advice to anneal both pieces (ring and mount) before soldering due to different rates of metal expansion/contraction and to pre-flush platinum mount stem with a hard gold solder and then use a softer gold solder to attach the two pieces. Any other tips?