Unverified85% confidenceDecision RuleTime unknown
二手金属配饰（项链/手链）辨真伪看内侧钢印与含金量标识（如750/585/925），真品钢印边缘清晰不糊，925银氧化后呈灰黑色可抛光，若为镀层氧化则会露出黄铜底色无法恢复
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