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turkish handmade jewelry wholesale 1. CMA — is a sign that the testing agency is measured for the qualification of the certificate. The institution with this sign is a legal inspection agency.
2, CAL — is a sign of inspection and inspection agencies recognized by national quality review. Organizations with this sign are eligible to make arbitration inspection conclusions.
3, CNAL -National Laboratory logo.
The above three signs are valid, especially the first label CMA, which is the basic requirement for national laws to test and inspection agencies. Famous bead jade products are generally identified by the Ruili monitoring station in Dehong Prefecture, Yunnan Province, with two signs: CMA and CAL. At the same time, the emerald products of famous beads can be identified in any appraisal agency to ensure the quality of emerald A goods.
The test results are checked. If it is not a natural A cash emerald, the results will not indicate the words "A goods" and "natural". Be sure to pay attention.
Only when it is a natural A cargo, the result will be the "jade" certificate;
If it is B the jadeite, the result of the certification appraisal will indicate "jadeite (processing)", "emerald) "Note)", "Emerald (B)" or "Emerald (Optimization)";
c Sweet Emerald, which will indicate "Emerald (Dyeing)"; There will be no word "emerald". What kind of substitutes are, indicate the name of this substitute -such as "artificial glass", "dyeing quartz rock", "sauce jade", "Malay jade" and so on.
Suled the jadeite appraisal certificate, there should also be some basic physical physical and other content of the famous beads:
refractive index: 1.66 (this is a unique refractive index that is unique to other gems itself);
density: 3.33 (also the characteristic of the distinction between emerald and other gems);
amplification detection: fiber intertwined structure (this is a structure unique to jadeite);
absorption spectrum: 437nm absorption line (which is unique to emeralds. The absorption spectrum);
The filter filter: no response (some dyeing emerald will turn red under the color filter mirror);
The light: collection (emerald is a microcontroller collection);
fluorescence Sex: None (some B goods will have fluorescent reactions after glue);
The appearance characteristics: glass gloss (some B goods will show waxy luster).
18k gold will indicate AU750
The inspection confirms whether there is a steel print of the appraisal unit above. The most important point on the Emerald Appraisal Certificate is that there must be steel seals or anti -counterfeiting signs on the certificate.
Check the authenticity of its phone number. Check the phone number of the appraisal unit on the jade appraisal certificate, call the past to consult, inform the experiment number, and ask the other party to inform the appraisal results.
The authenticity of the certificate through the network. Check the website of the appraisal unit on the emerald appraisal certificate, log in to access online, enter the experiment number, and query the identification results.