1. National standards for pearl testing
According to the national standard "GB/T16552-1996 jewellery jade name" in the column of pearls, the pearls are classified as "pearl, seawater pearls, freshwater pearls, cultured pearls, marine cultured pearls, freshwater cultured pearls". In the column of optimization processing, the pearls are classified into “bleaching-optimization, dyeing treatment-treatment, irradiation treatment-treatmentâ€.
It is known from the Shanghai market survey that it is very common to optimize the treatment of "black pearls (treatment)" formed by dyeing. When consumers buy black pearls, they must ask the store whether they are natural or dyed; the store should also actively introduce to consumers whether the black pearl is natural or dyed.
2, black pearl detection error
Black pearls can be correctly measured by corresponding detection methods and methods, but now individual testing institutions and individuals have led the detection of black pearls to misunderstanding. A black pearl wrote "the cause of black cannot be determined" in the certificate of testing. This kind of writing is not appropriate, and it is also an irresponsible practice. If there is no corresponding means and methods, it is best not to issue a certificate to avoid misleading consumption. . After this certificate is issued, is the consumer buying it according to black pearls or buying black pearls by dyeing? Is the store priced at Black Pearl or is it priced for black pearl? I have tested a dyed black pearl chain. The other party asks not to identify the color. How can the color not be identified and how to issue the certificate? The other party suggested that the "black cause can not be determined" on a certificate and printed on the certificate, so that it is not a fish! The Jewelry Testing Center also refuses to issue an identification certificate.
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