National Inspection (NGSTC) Diamond Certificate: National Gold and Silver Products Quality Supervision and Inspection Center (Nanjing) (hereinafter referred to as the Center) is a national product quality supervision and inspection institution established by the General Administration of Quality Supervision, Inspection and Quarantine according to law, and has passed the national metrological certification, national examination and approval, and national laboratory accreditation. Undertake quality supervision and spot check, arbitration inspection and entrusted inspection of precious metals, jewelry and jade products nationwide. Senior engineer engaged in precious metal detection, national registered quality inspector engaged in jewelry and jade identification and diamond grading, etc. It has jewelry detection and diamond grading equipment, as well as TraceScan micro-plasma emission spectrometer, full-spectrum direct-reading plasma emission spectrometer, Quan-X high-performance X-ray fluorescence spectrometer, Nicolet infrared spectrometer, diamond proportioning instrument, diamond precious metal engraving machine and other large instruments. Specializing in precious metal raw materials, products and coatings testing, jewelry and jade identification, diamond classification. International GIA diamond certificate: GIA Gemologia Linsituteofofamerica (GIA) is the founder of promoting the internationalization of diamond appraisal certificate. It was established in Los Angeles on 193 1 and is an independent non-profit organization. As the authority of the world gem, GIA is famous for its justice. Because GIA does not involve for-profit business, it will not be affected by human factors under the premise of reputation first, so it has great credibility in the content quality of the appraisal book. The institute is trusted by the world in diamond classification and gem identification, and is famous for its knowledge and expert position in gem. It created and proposed an international classification system. In fact, GIA diamond classification report and GIA diamond processing are considered to be the first gem certificates in the world. Diamonds of all sizes are sent from all corners of the world to the college for analysis and classification. Since 1953, when richart. Liddicoat founded and popularized this international diamond grading system, which is now the most respected and authoritative diamond grading and appraisal institution in the United States. GIA is the founder of Diamond 4C, and the GIA standard is used as a reference by appraisal institutions all over the world. Diamonds with GIA diamond certificate are recognized all over the world, while the national diamond certificate is only valid in China, and the rating of national diamonds relative to GIA diamonds is reserved. Generally speaking, it is normal to have differences in color and clarity. GIA is a rough diamond grading certificate, while the national inspection is generally a diamond-encrusted grading certificate, which is why some people think that the national inspection is stricter than GIA. Because they are independent and authoritative testing institutions in two different regions, there must be subtle differences in testing standards, such as:
1, GIA only issued the classification certificate for loose diamonds.
2. The national inspection has grading certificates for loose diamonds and diamond-encrusted diamonds. Generally, we refer to the classification certificate of diamond-encrusted diamonds in the national inspection.
3.GIA's testing standards tend to cut diamonds.
4. The national inspection standards tend to be the color and clarity of diamonds.
5. The data of 5.GIA certificate is more detailed.
6. The data of 6.NGTC certificate is somewhat simplified.
7. There is basically no difference in the identification above 1 carat, but there may be differences below1carat.
Legal basis: Article 30 of the Notary Law of People's Republic of China (PRC).
After examination, the notary office considers that the certification materials provided by the applicant are true, lawful and sufficient, and the matters applied for notarization are true and lawful, and shall issue a notarial certificate to the parties within 15 working days from the date of accepting the notarization application. However, due to force majeure, supplementary certification materials or the need to verify relevant information, the time required is not counted in the time limit.