Unverified50% confidenceFactTime unknown
判断真珠可用牙齿轻蹭珠面，真珠有明显砂砾感（珍珠层结构），仿珠（玻璃/贝壳/塑料）表面光滑；仿珠多颗光泽和瑕疵完全一致，真珠每颗必有细微差异
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