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I sell jewelry and some people are so strict about this. Imo, if the jewels are really close together, like huge earrings and a necklace, then it would be preferable if they were made of the same metal but at the same time, I don't think that a gold bracelet and a silver ring look bad together. I think it's the same as mixing blue and black - some people have this weird thought that it's somewhat forbidden and don't even try to wear them together.
I like it provided it looks like it was done intentionally and not accidentally, if that makes sense. Stackable rings in white gold/silver and yellow gold, several bracelets in different metals or several chains in mixed metals works for me. But wearing a YG necklace with WG earrings, for example, looks random and doesn't work for me. Overall, though, I've decided I am much more of a YG person, so I don't mix much.