Unverified82% confidenceTradeoffTime unknown
镀金（镀真金）与包金（K金层≥10K且厚度≥1/20）耐磨度差异大：镀金层通常＜0.5微米，日常摩擦1-2年易露底色；预算够选18K金实心或包金款更耐久
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