Hello, I would love some advice on this problem that has happened a few time with some of my setting, manly rings. After a year, minimum, a dark mark appears under the stone a long where the stone is set to the band or a jump ring. I use easy solder paste, is this wrong? Also it’s not ever stone only some. Thank you for your help, I’ve tried to attach a photo don’t know if it worked 🤪
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