Ring true and false identification of effective tips

Ring of true and false recognition, this is really important, I hope the following pairs of brides helpful:



(1) diamond jewelry certificate of authenticity cloud mask, a grafting grafting, and have cloned copy, and also with a "group identity" of;
(2) diamond ring sign only standard English letters or Chinese pinyin name is not marked in accordance with specifications, composition, content and special treatment (deceive consumers do not know jewelry knowledge, deliberately confuse);
(3) man-made and natural jewelry confused, obviously is not man-made artificial mark;

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