Have the same issue on my Audi where I curbed the wheel and caused minor damage. They are also diamond cut and when I took it to a specialist he explained that they have to be cut back a few millimetres to fix it (can't be fillered) which would then affect the look of the alloy too. He suggested to leave it until it was curbed again/far worse but to put a coat of clear nail polish over the mark. I've done that and although it's not great they've not corroded
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