Which most reliable diamond certificate of authenticity?

Identification of the diamond market, a wide variety of certificate, and businesses say their diamond certificate of authenticity is the most authoritative, in fact, in the interest of driver relations, almost all of the certificates have a "human relationship" in which the best way are two: First, the "detour" the second is to look up the certificate in the three most important indicators
However, the four foreign certificate, have their own characteristics:
First, the Gemological Institute of America GIA, cut assessment and classification is very small, and the most stringent. For clarity, grasp the very place, almost every waist diamonds are inscribed on the GIA certificate number, on a perfect Hearts and Arrows Effect of diamonds around the waist inscribed H & A logo. GIA is the world's most authoritative identification of the jewelry, the synthetic diamonds change color depth. Have GIA certified diamonds to ensure that the causes are natural diamonds, the color is natural causes. Notarization of no question, including the identification of diamonds, GIA grading standards are developed, has the world's diamonds in a professional appraisal website, each of a diamond after 2000 can check online. The same level of the same cut GIA certified diamonds are the most expensive. 95% of basic to the recognition by national accreditation bodies. diamond diamond.yifei8.net
Domestic diamond appraisal certificate, identification of the fairness of the whole is not stable enough. There are two main tendencies:
First, "Yan was outrageous." There are internal certificate "National Gemstone Testing Center," the "state inspection." For example, a friend took through GIA certified as VS1, G Diamond, after re-examination into VS1, J color, and more phenomenon is even G H I color into color, the use of such "strict" , to establish their own "authority", the results to scare away a large number of diamond dealers.
Second, "human Certificate" has occurred. Mainly in the "local protectionism", many consumers buy the A to B to get to the identification of diamonds, resulting in a lot of misunderstanding.
Third, evaluation of classification is too coarse cut. Main categories are: general, good, very good. Foreign certificate on the diamond cut indicators of a large 7. Table size, 2. The whole depth ratio of 3 to 4 crown angle, crown height ratio of 5, 6, pavilion depth, thick waist ratio, 7, the end point are marked than the understand, at the same time cut the polishing degree, symmetry are marked very detailed than the domestic certificate is too simplistic, and many testing organizations with more than colored stones are used instead of zircon, big error will also be able to understand. diamond diamond.yifei8.net
Why cut it important? When a bunch of white light through the diamond, if it first passes through the diamond table for reflection, and then in the diamond internal reflection, and finally went out completely refracted through the diamond table, it will be the white light into seven colors of light, and the main wavelength of the color is red, blue, yellow, so we cut the naked eye to see a good diamond, you can feel the colors from the issue of diamonds in light and in red, blue, yellow and light-based, turning to look at to as rainbow light. Fully reflects the light so that the diamond is shining brilliantly feel, glamorous and full of charm.
When the diamond table is too small, too large deep booths (known as "chimney"), the light will be refracted through a pavilion from the other side of the escape, so that the diamond appears bleak; the table than diamonds large (commonly known as "flying saucer"), the pavilion too shallow, light without refraction had leaked directly from the diamond pavilion, and certainly not reflecting colorful light.
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The best cut from the tops of most of the light through internal reflection from the post into the table the most perfect cut is exactly the ideal reflection of light does not leak, and only cut evaluation of all "EXCELLENT = perfect excellence & rdquo ;, you select the most demanding diamonds.
Similarly, one carat of rough diamonds, processed into the best cut diamonds, made only the bare 0.25-0.30 carat diamond, rough out into the rate of 25%; if processed into a "chimney" or "flying saucer ", then can be processed into bare 0.40-0.50 carat diamond, so near perfect harsh cut diamonds, diamond dealer killed you, it would not be too cheap to sell you.

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