Pearl is one of the traditional jewels in China. As early as 4,000 years ago, in the "History of the Sea", there was a record of "the Emperor of the South China Sea, the seaweed and the pearl". "Beads" in "jewels and jade" refers exclusively to pearls. At present, China has formed six freshwater pearl breeding bases in Hunan, Jiangsu, Zhejiang, Anhui, Hubei and Jiangxi, seawater breeding bases in Guangxi, Guangdong and Hainan, pearl processing in Zhuji, Zhejiang, Suzhou, Tanggu, Guangxi Beihai and Hainan Haikou. Batch and distribution center. Faced with the large supply of pearl jewelry on the market, how do consumers distinguish the advantages and disadvantages of products, how to choose pearls, and from which aspects to evaluate the quality of pearls?
Pearl identification and classification
According to GB/T16552 "Jewelry and Jade Name", GB/T16553 "Jewelry and Jade Identification" test samples, identification and classification:
According to different growth modes, natural seawater pearls and natural freshwater pearls can be divided into marine cultured pearls and freshwater cultured pearls. According to the presence or absence of pearl nucleus, they can be divided into nucleated cultured pearls and non-nuclear cultured pearls.
According to whether it is shell or not, it can be divided into free cultured pearls and shell-type cultured pearl pearls. According to the output mechanism, it is divided into natural pearls and cultured pearls. At the same time, it is divided into seawater and fresh water according to the produced waters. The cultured pearls are based on the national standard GB/T16552. -2003 Jewelry jade name, which can be referred to as pearl, but the English name is still CULTUREDPEARL.
Quality factor level evaluation
The quality factors were evaluated in terms of color, size, shape, gloss, finish, and bead thickness (nuclear pearl).
Color
The color of the pearl is divided into white, red, yellow, black and other five series, each series includes a variety of body color. Such as:
White series: pure white, milk white, silver white, porcelain white, etc.; red series: pink, light rose, lavender, etc.;
Yellow series: light yellow, beige, gold, orange, etc.;
Black series: black, blue black, gray black, brown black, purple black, brown black, iron gray, etc.; other: purple, brown, cyan, blue, brown, purple, green, light blue, green, bronze Wait.
Pearls may have associated colors such as white, pink, rose, silver or green. Pearls may have a faint color, and the halo is divided into a halo, a halo, and a faint. Color description: mainly based on body color description, supplemented by color and halo description.
2. Size
The round, round, and near-round pearls are represented by the smallest diameter, and the other shapes of the cultured pearls are represented by the largest size by the smallest size, and the bulk beads can be expressed by the aperture range of the pearl sieve.
Measure the size of the pearl (according to the calculation, the roundness of the pearl is a perfect circle, a circle or a near circle)
3. Shape level
4. Gloss level
5. Finish level
After comparison with standard samples, it is possible to have the following ambiguities:
6. Bead thickness level
Current detection methods include X-ray photography, OCT optical coherence tomography, bead thickness detection methods, and direct measurement methods.
The pearl grading mark expressly includes at least:
(1) Name (should indicate seawater pearls or freshwater pearls);
(2) pearl grade;
(3) size;
(4) shape, gloss, finish, bead thickness (if involved), matching (if involved);
(5) Name of the manufacturer and site;
(6) Execution of the standard number.
NGTC grading certification for pearls
The National Jewelry Quality Supervision and Inspection Center specializes in the establishment of pearl grading inspection for pearl beads and accessories, and issues a pearl grading certificate. The certificate provides information on the types of pearls, the six quality factors of pearl grading, and the pearl grade. It will be for consumers. A clear understanding of the quality level information of all aspects of the pearls purchased, so that consumers can rest assured to buy, buy and rest assured.
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Logo Printing: Customized
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