Below the diamond lap for the laser engraving of the enlarged photo affixed to the certificate for easy verification

As the world’s three major authoritative institutions in the true sense of the only cross-continent global laboratory, IGI to solve the various laboratory standards a high degree of unity of the problem, its stability has been widely respected by the industry, the famous Mont Blanc, Cartier , Escada and other international brands have chosen IGI to provide identification or training services.
First, the certificate title part:
International Gemological Institute is the name and logo of the IGI Lab
HEARTS AND ARROWS DIAMOND REPORT is the certificate name
The upper right corner is the diamond “eight heart” and “eight arrows” darkroom photos, photos for the actual shooting and affixed to the certificate.
Second, the contents of the certificate Part I:
The first line on the left there will be a Number, this is the certificate number, and each diamond waist laser lettering is one to one correspondence, the only Internet access is by virtue of this number, with 10 times magnifying glass in the diamond waist You can see this imitation Cartier love bracelet, of course, unless the business did not require IGI engraved. This is also possible.
Antwerp on the right side of the first line, December 13, 2002 is the time and place of the certificate.
The mainland’s most visited locations are Hong Kong and Antwerp.
Third, the contents of the certificate Part II:
Description of Diamond. Natural diamond for natural diamonds.
Shape and cut is the basic cut shape, Round and brilliant for the round brilliant type.
Fourth, the contents of the third part of the certificate 4C:
Carat weight is the weight of the caravan. 1 gram = 5 carats, 1 carat = 100 points. IGI calculated to the decimal point after the two, the third every 9 into a, such as 67.88 67 points, 67.89 count 68 points; where the weight is 53 points, or 0.53 karats.
Claritygrade is the clarity of diamonds. IGI divides diamonds into several large grades of IF-VVS-VS-Si-I according to the nature, quantity and visibility of the internal defects of diamonds. VVS is divided into VVS1 and VVS2, VS Divided into VS1 and VS2, Si is divided into Si1 and Si2, clarity gradually reduced. This diamond is IF, that is the best clarity (10 times magnifying glass defects are not visible). The clarity here is VS2
Corresponding to the right of the two diamond patterns, called ploting diagram, is the grading division of the specific flaws of the location, type, etc., to facilitate consumer checks.
Common are cloud (cloud), crystal (crystal), feather (pinnate), pp (tip) and so on.
Internal flaws are marked in red, and external flaws are marked in green.
Color grade is the color level, IGI diamonds from completely colorless to yellow letters from D to Z said, the best colorless diamonds are D color, E, F, G gradually yellow, Z color level lowest. Where the color is E color, D, E, F is very rare.
Cutgrade is a diamond cut. That is, the proportion of diamond polished cut to determine whether the diamond can show a good fire color and flash. Cut is a comprehensive measure of many cutting faces, including symmetry and polishing. IGI will cut from Excellent to Very Good, Good, Fair, Poor is divided into 5 grades, where the cut is the best.
Here are two other data related to the cut:
Polish is the diamond’s degree of polishing and symmetry. And cut into five grades.
Symmetry is the symmetry of diamonds. And cut into five grades.
The IGI is critical of cutting work and must meet extremely high cut Replica Cartier jewelry requirements.
The following is the detailed data:
Measurements refers to the size of the diamond, that is, the diameter of the diamond * height. Diamond is hand-polished, and sometimes can not guarantee its 100% round, so there are two different diameter, maximum diameter and minimum diameter. General diamond gap within 3%.
Table diameter is the aspect ratio, that is, the ratio of the table width to diameter.
Crown height is the crown height ratio, that is, the crown height of the proportion of diameter.
Pavilion depth is the ratio of pavilion depth, ie pavilion depth to diameter.
Girdle thickness is the waist thickness, usually from thin to thick thick are possible.
Total depth is the ratio of the height and diameter of the diamond.
Culet refers to the bottom of the diamond case, here is the pointed, that is, the tip, in addition, there may be medium middle bottom, large base, chopped broken bottom.
Fluorescence here refers to the fluorescent effect of diamonds. Most of the diamonds in the ultraviolet light will have blue and white fluorescence, fluorescent color and most of the diamond itself with a weak yellow color is complementary. For high color diamonds above J color, strong fluorescence has a negative effect on the value of diamonds. For J colors and below, low intensity diamonds have a positive effect on diamond value, while weak fluorescence has no effect on diamond value.
Comments lists any information related to the quality of diamonds, such as diamonds lined laser engraving content, or eight heart eight arrows diamond, whether it has been manually optimized, will be listed in this column. The diamond information is: eight heart eight arrows ideal cut (so far IGI is still the most authoritative eight heart eight arrows diamond identification), waist lettering (diamond certificate number).
Below the diamond lap for the laser engraving of the enlarged photo, affixed to the certificate for easy verification.
Photo on the right for the IGI laser security signs.
IGI’s industry status
IGI is currently the world’s largest independent laboratory, the global experts to 800 members, distribution of the world more than ten countries, IGI’s patented invention and technology are laser lettering, darkroom photo, the first eight to eight evaluation criteria, and first created 3EX cut the evaluation system, the system is the current international standard diamond cut grade evaluation method, there are more than 100 countries of the jewelry industry to accept IGI services.
1975 – 1985
IGI is now the oldest laboratory in Antwerp IGI gem school in the world’s first diamond rough course IGI laser system imprint (IGI Laserscribe System Mark) patented the use of laser permanent mark diamond method IGI is the world’s first jewelry Laboratory certification IGI is the world’s only laboratory for diamond correction and re-cutting services IGI is the world’s first diamond seal service to provide protection for diamonds laboratory IGI developed a complete comprehensive diamond cut rating table
1986 – 1999
IGI is the first to use ion beam technology in the diamond countertops to achieve permanent imprinting IGI laboratory fully equipped with conditional identification synthetic diamonds IGI research and development UV-VIS-NIR spectrometer identification of artificial diamond IGI research and development of a unique photoluminescence (photoluminescence) spectrometer identification HPHT Dealing with diamonds IGI became the first global operation, unified management of the laboratory. Today there are 15 laboratories around the world.
2000 – 2010
IGI Develops an Innovative Grading System for Small Diamonds IGI is the first laboratory to issue a dual-brand certificate for industry-renowned brands. IGI offers factory-based hands-on courses, improved production IGI offers courses for salespeople and consumers, Industry knowledge IGI created the world respected eight heart eight arrow diamond certificate.

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