Interpretation of the GIA Diamond Test Report

Sample of GIA Diamond Certificate:

Content on the certificate:
1, the certificate number;
2, date, laser imprint, shape and size;
3, 4C part, weight, color, clarity, cut;
4, inclusions, degree of modification, fluorescence reflection and special lettering;
5, show the diamond's clarity, color, and cut in the relevant position in the GIA level;
6, diamond cut data map;
7, security watermark;
8, submit the company's nationality;
9, or about 4C and some other detailed data, cut measurement data.
Among them, 8 and 9 are mainly for people in the industry.

If this diamond report exists, the following will be displayed Report Type: GIA Diamond Dossier® ← Report Type: GIA Diamond File Laser Inscription Registry: GIA 15957486 ← Laser Marking “Laser Number”: GIA 15957486
Round Brilliant ← Round Brilliant 4 Round Brightness Me Type Measurements : 4.30 - 4.32 x 2.67 mm ← Size : . . .
Carat Weight: 0.30 ← Carat Weight: 0.30ct = 30 Points Color Grade: E← Color Rating: E ​​Color Grade Clarity Grade: VS2 ← Clear Degree Grade: VS2
Cut Grade: Excellent ← Cut Grade: Excellent Proportions: ← Depth: 61.9% ← Full Ratio:. . .
Table: 55% ← table width ratio:. . .
Crown Angle: 34.5 ° ← Crown:. . .
Crown Height: 15.5% ← Crown Height Ratio:. . .
Pavilion Angle: 41 ° ← Pavilion angle : . . .
Pavilion Depth: 43% ← Pavilion Depth:. . .
Star length: 55%. . .
Lower Half: 80% ← lower waist face ratio:. . .
Girdle: Thin to Medium, Faceted ← Waist Edge: Thin-Medium, Faceted Grungy Culet: None ← Bottom: None Finish: ← Correct Polish: Excellent ← Polished: Excellent Symmetry: Excellent ← Symmetry: Extreme Excellent Fluorescence: None ← Fluorescence: No Clarity Characteristics: Cloud, Crystal ← Inclusion Features: Cloud, Crystal Color Grading (Color Grade): National Standardization: DE White, FG White, H White, IJ Yellow White, KL Light yellow white, M, N light yellow. . . . . . GIA divided: DEF colorless GHIJ nearly colorless KLM slightly yellow. . . . . .
The GIA's colorimetric stone starts with E color and is not D colorimetric stone. GIA uses the upper limit colorimetric method. What is the upper limit colorimetric method? If a diamond's color is between the GIA color stone E and the color stone F, then the diamond's grade is E, not the F color, and the GIA's color stone is the upper limit of the diamond. The stone is F, which means that the color stone is the best in the F class. The color exceeding it is the E color, and so on. Therefore, the color stone of the GIA is not D color because there is no higher color than the D color. More than their E color stone is the D color. . . .
The diamond color grading is performed under the diamond colorimetric lamp, but it is affected by ambient light, and the GIA uses their patented diamond box and is left in a 4-week closed, white background box. Observed by the examiner, the light source is installed in this box and is less affected by the surrounding environment.
The following is a set of colorimetric stones, the upper limit color stone. Due to the network, the cartridges can only be viewed one by one, and cannot be used as an accurate measure.

Clarity Grade: This is how much the diamond's content is under 10x magnification. The GIA classifies the diamond's clarity into FL (no defects), IF (internal defects), VVS1-VVS2 (very minor defects), VS1-VS2 (small defects), SI1-SI2 (deuterium), and I1-I2-I3 (double defects) ) Levels, etc., decrease from front to back.
The cost-effectiveness of wearing a 1 carat or less is VS1-VS2, but it requires attention to color and cut. SI can also, but to select the color grade and cut good, with the naked eye can not distinguish the SI level and VS level, looks very beautiful. A diamond that generally rises in value by more than 1 carat, from the clarity of the VVS2 upward, the color must be above the H color, and there must be a good cut. Because the diamonds that meet the purity level conditions are very rare, the general diamond transaction is based on the internal clean grade as the highest degree of clarity (commonly known as the United States). Clarity is a description of the characteristics contained within or outside of a diamond. GIA does not encourage it to be called ç‘•ç–µ, because ç‘•ç–µ has a negative meaning.
Suggestions on diamond clarity: (1) The better the diamond's clarity, the higher the price. When you want to buy high-clarity diamonds or for investment and collection, then VVS level or above is the most suitable, but do not ignore the value of color and cut. When you have no special requirements on the clarity of the diamond, choose VS. The cost performance of SI is the highest. You can't distinguish between SI level and VS level with the naked eye. However, individual diamonds of SI2 can sometimes be seen unclearly when viewed with the naked eye. Inclusions. The skeleton is also part of the diamond. It is a unique mark that Nature has made for each diamond, and there is also a distinct difference in price.

GIA Clarity Rating Standard:
FL-IF Grade Clarity: "FL" = No Grade: There is no grade for inclusions or defects. A completely flawless diamond. IF = no rank: There is no inherent jealousy. This level of clarity diamonds have slight scratches on the outside of the diamond, but the interior is completely flawless. Both of these two clarity grade diamonds are extremely rare.
VVS1 - 2 level of clarity: very slight level. The diamond clarity of VVS1 is slightly better than the diamond clarity of VVS2.
VS1 - 2 level of clarity: micro-level. A VS1 diamond has a slightly better diamond clarity than a VS2 diamond. The inclusions of these diamonds are invisible to the naked eye. The price is several points lower than the high level of clarity. This clarity level diamond is very beautiful, and the value is higher SI1 - 2 level of clarity: micro-level. The diamond clarity of the SI1 level is slightly better than that of the SI2 diamond. The content of diamonds of this degree of clarity can be seen by a professional magnifier. This grade of diamond has a unique price and value.

Cut Grade: It refers to the evaluation and explanation of the ratio and degree of modification of the finished diamond, which directly affects the overall effect of the brightness and the fire color of the diamond and the balance relationship between the two, which is very important. In the GIA certification system, Excellent is excellent, Very good is excellent, Good is good, Fair is fair, Poor is poor. The latter two are not considered when purchasing loose diamonds. This measure of cut is an important factor that only the technicians can use to make the beauty of diamonds rise again. The size, proportion, symmetry, and polish of the cut diamond surface, together with the change in the angle of the cut surface, give rise to diamond luster that can have brightness, fire, and flicker. The ideal criterion for cutting is to show the average of these three indicators.

GIA is how to formulate the cut grade GIA has passed many years of research and accumulated data analysis, introduced today's most complete system of cut grading assessment system method, GIA as the originator of diamond grading, launched diamonds from the end of 05 After the grading of the cut, the market and consumers have brought more simple and obvious standards for the assessment of diamonds. Here we can only briefly introduce the GIA cut grading. The GIA cut grading still requires a lot of special equipment to complete of.
The grading of the cut is mainly done through two major parts. The first part is based on the evaluation of the appearance and basic measurements of the cut grinding registration. This part passes two minor parts, 1 (brightness, flare, light and shade), 2 (weight and diameter Relationship, full depth percentage, table width ratio), and then estimate one of the five levels EX, VG, G, F, P,
The second part is based on the ratio and degree of modification to estimate the cut-off grade, which is also divided into 2 sub-parts for comprehensive evaluation, 1 (table width ratio, crown angle, crown height ratio, star facet ratio, waist thickness, Bottom angle, waist-to-face ratio, waist thickness ratio, tip size, 2 (polishing, symmetry) and then evaluate the final results from the five levels EX, VG, G, F, P,
The final cut level requires a minimum of 2 most of the assessment data.
Each small part is also divided into five EX, VG, G, F, and P grades, and the final choice is still the lowest one.
Therefore, EX, especially the diamond of 3 EX's GIA certificate, is indeed perfect from the appearance or the overall feeling.
This kind of cut grade is quite comprehensive, except that IGI's cut grade is slightly similar to GIA. Now, there isn't any testing organization's testing room that can do such a comprehensive rating.
The quality of the cut directly affects the brightness, fire and flicker of the diamond.