I have a ring from Warren Jewelers that uses white and rose gold. Tiffany does a lot of two tone pieces metals; their new lock line comes to mind.
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James Banks mixes metals too.
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Le Gramme is more aimed towards men, but I love the aesthetic and they have mixed options (as well as custom potential).
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I'm also currently eyeing LV's Idylle Blossom line.
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Another option is finding pieces you love from smaller brands and seeing if a two-tone option can be custom made for you, like a diamond station piece where the chain is yellow gold and the bezel is white gold.
Also, an easy alternative is to swap out the chain for a pendant, mixing the two. This came with the chain shown, but shows what I'm talking about:
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Thanks for your suggestions! I LOVE the yellow and white Tiffany Lock….one day
