Size: 4.30-4.32x2.67mm/size:. . .
Carat weight: 0.35/carat weight: 0.35 carat =35 minutes.
Color grade: G← color classification: g color scale
Clarity grade: VS2← Clarity classification:
Vs2 Cutting Grade: Excellent/Cutting Grade:
Excellent proposal: ← scale: ← depth: 6 1.9 %← overall depth ratio:. . .
Table: 55 %← Table width ratio:. . .
Crown angle: 34.5 ← Crown angle:. . .
Crown height:15.5%/crown height ratio:. . .
Pavilion angle: 4 1 ← Pavilion angle:. . .
Pavilion depth: 43%←/ Pavilion depth ratio:. . .
Star length: 55%/ facet ratio:. . .
Lower half: 80%↓/ Lower waist facet ratio:. . .
Belt: thin to medium,
Multi-faceted waist rib: thin to medium thickness, multi-faceted waist rib
Culet: no bottom tip: none.
Surface: moderate repair
Polishing: Excellent/Polishing: Excellent
Symmetry: Excellent/Symmetry: Excellent
Fluorescence: None/Fluorescence: None.
Clarity characteristics: clouds and crystals ← Inclusion characteristics: clouds and crystals. The test results may be different each time. What do you mean? How to judge the quality of this test result? Say it one by one. What does the data of this item mean? What is the standard of division? What kind of data may appear? Now let's start a detailed analysis. . . Color grade: according to national standards, de is extremely white, F G is excellent white, H white, IJ is yellow white, KL is yellow white, and M and N are yellow white. . . . . . GIA division: D E F colorless G H I J nearly colorless K L M yellowish. . . . . . GIA's colorimetric stones start with e, but there is no D-colored colorimetric stone. GIA uses upper limit colorimetry. What is the upper limit colorimetry? If the color of a diamond is between GIA's colorimetric stone E and colorimetric stone F, then the grade of this diamond is E, not F, and GIA's colorimetric stone is the upper limit of this diamond. If the colorimetric stone is F, it means that the colorimetric stone is the best in the F class, and the color beyond it is E, and so on. Therefore, the colorimetric stones of GIA have no D color, because there is no color higher than D color, which exceeds their E color. . . . Diamond color grading is carried out under the diamond colorimetric lamp, but it will be affected by ambient light. GIA uses their patented diamond box, which is enclosed all around and has a pure white background, leaving a mouth for inspectors to observe. The light source is installed in this box, which is less affected by the surrounding environment.
Below is a set of colorimetric stones, upper limit colorimetric stones. pass by
Because of the network, we can only have a cursory look, not as an accurate measure. . . Clarity grade: that is, the content of diamonds under 10 times magnifying glass. GIA classifies diamond clarity into FL (flawless), IF (internal flawless), VVS 1-VVS2 (minimal flaw), VS 1-VS2 (minimal flaw), SI 1-SI2 (flaw) and I1-. 1 carat and below is VS 1-VS2, but pay attention to color and cutting. SI is ok, but if you choose the color grade and cut it well, you can't tell the difference between SI grade and VS grade with the naked eye, and it looks beautiful. Generally, the appreciation of diamonds should exceed 1 carat. Judging from the clarity of VVS2, the color should be above H, and there should be a good cut. Because diamonds that meet the requirements of purity grade are very rare, the internal purity grade is the highest purity grade in general diamond trading (commonly known as the United States). Clarity is a description of the characteristics contained inside or outside a diamond. GIA does not encourage it to be called a defect because it has a negative meaning. Suggestions on diamond clarity: (1) The better the diamond clarity, the higher the price. When you want to buy high-purity diamonds or use them for investment and collection, VVS or above is the most suitable, but don't ignore the value of color and cutting. When you don't have special requirements for the clarity of diamonds, choose VS, and the SI grade is the most cost-effective. The naked eye can't tell the difference between the SI grade and the VS grade. However, the individual diamonds of SI2 sometimes have unclear inclusions with naked eyes. Defects are also a part of diamonds, which are unique marks made by nature for each diamond, and there are obvious differences in price. Let's get what we need. GIA clarity grading standard: FL-IF clarity: "fl" = flawless grade: completely flawless diamond. IF= internal flawless level: no internal flaws. For this grade of diamond, there are slight scratches on the outside of the diamond, but there are no flaws on the inside. These two kinds of clarity diamonds are extremely rare. VVS 1-2 cleanliness: extremely defective. The diamond clarity of VVS 1 grade is slightly better than that of VVS2 grade. The definition of VS 1-2 is slightly defective. The diamond clarity of VS 1 is slightly better than that of VS2. These diamonds contain inclusions invisible to the naked eye. The price is a few points lower than the high-end clear. This kind of clarity grade diamond is very beautiful, and its value is higher than that of SI 1-2 grade diamond: slight defect grade. The clarity of Si 1 grade diamond is slightly better than that of SI2 grade diamond. The contents of this clarity diamond can only be seen by professionals with a magnifying glass. This kind of clarity diamond has unique price and value. The following is a schematic diagram of diamond clarity classification. In the schematic diagram, the approximate relationship between the number and position of inclusions in diamond clarity classification is expressed. Cut grade refers to the evaluation and explanation of the proportion and decoration of finished diamonds, which directly affects the brightness of diamonds, the overall effect of fire color and the balance between them. This is very important. In the GIA certificate system, Excellence means Excellence, very good means Excellence, good means good, general means average, and poor means poor. The latter two are not considered when buying loose diamonds. Cutting work is a measure and an important factor. Only through the operation of technicians can the beauty of diamonds be further enhanced. The size, proportion, symmetry, polishing and other effects of cutting diamond surface, combined with the change of cutting surface angle, can produce diamond luster, brightness, fire color and flicker. The ideal standard of cutting and grinding is that these three indexes are uniform. How did GIA calculate the cutting classification? After years of research and accumulated data analysis, GIA put forward a set of the most perfect systematic methods of cutting classification evaluation. As the originator of diamond classification, GIA has brought simpler and more obvious criteria for judging diamonds to the market and consumers since it introduced diamond cut classification at the end of 2005. Here, we can only briefly introduce GIA cut classification. GIA's cutting classification can only be completed with the help of many special instruments and equipment. Cutting classification is mainly completed in two parts. The first part is the registration of cutting and grinding according to appearance and basic measurement. This part passes through two small parts, 1 (brightness, fire, light and shade) and 2 (relationship between weight and diameter, ratio of full depth to table width), and then EX, VG and g are estimated first. The second part is to estimate the cutting grade according to the proportion and the degree of modification, and it is also divided into two secondary parts for comprehensive evaluation, 1 (table width ratio, crown angle, crown height ratio, star facet ratio, waist thickness, bottom angle, waist facet ratio, waist thickness ratio, and sharp bottom size), 2 (polishing, symmetry), and then from EX, VG, g, f, and sharp bottom size. Therefore, EX with GIA certificate, especially 3 EX diamonds, has a perfect appearance and overall feeling. This cutting classification is quite comprehensive. Except that the cutting classification of IGI is slightly similar to that of GIA, no laboratory of any testing institution can make such a comprehensive rating. The cutting quality is good or bad. . . From left to right, the following figure shows the brightness of excellent cutting to general cutting, and the cutting-grinding ratio is an important content and basis of diamond cutting classification. The most important things are: table size, crown angle, crown height, waist edge thickness, pavilion angle, pavilion depth, bottom tip size, waist edge contour, length-width ratio and full-depth ratio.
. Percentage of total depth: the percentage of diamond height to the average diameter of waist. This ratio depends on the cutting work. GIA's standard is 56.8-62.4% as good-excellent; ; When it is lower than 55% or higher than 64%, there will be light leakage and the brightness will decrease. . Table percentage: The percentage of table width relative to the average diameter directly determines the fire color and brightness of a diamond, which is very important. GIA's standard is 52.5%-58.4% excellent. Americans prefer a small desktop, which will make diamonds full of fire. Some people say that buying a big table looks big, but there is less fire in diamonds, and it is meaningless to be big. Must be balanced. The mesa reflects brightness, and the main facet of the crown and the star facet reflect fire color. On the left of the figure below is a schematic diagram of the mesa from small to large, and on the right is the influence of various States of the full depth ratio on the brightness of the diamond. . . . Crown angle: the angle between the waist facet and the main facet of the crown. The crown angle and the table size jointly determine the fire color of the diamond. Generally speaking, 3 1-37 degrees is a good range, and 33-34.30 degrees is the best. . Crown height percentage: the vertical distance from the surface of the girdle to the table top, expressed as a percentage of the average girdle diameter. 1 1%~ 16% is the best. . Senkaku Angle: The angle between the waist facet and the main facet of the Senkaku in a round and bright cut. It is extremely important and directly determines the depth of the exhibition hall. Generally speaking, 40-42 degrees is the best. . Percentage of bottom depth: the vertical distance from the surface of the girdle to the tip of the bottom of a round brilliant cut diamond, expressed as a percentage of the average girdle diameter. It is of great significance in the evaluation, and it is generally believed that the pavilion depth ratio is about 43%. If the pavilion depth ratio is too large or too small, there will be obvious light leakage, which will make the brightness worse. Generally, the range of 4 1.5 ~ 45.0 is acceptable. In the picture below, on the right is an exploded view of a round and bright section, with the names of all parts of a section marked. On the right is the scale diagram. . . First of all, let's unify the names of all parts. 1, table top, also known as table top or drilling surface. 2, the main facet of the crown, also known as the kite surface. 3, star facet, also known as triangular facet. 4. The main aspect of the pavilion is also called the bottom aspect. 5, the pavilion, also known as the bottom. . Waist seal: waist seal thickness. If the waist is too thin, it is easy to damage the edge. If the waist is too thick, it will increase the weight and be smaller than its Kara weight. In GIA diamond analysis system, the waist seal thickness can be divided into extremely thin, extremely thin, thin, medium thick, slightly thick, thick, extremely thick and extremely thick. The waist seal state refers to the modification of girth, which is divided into three forms: 1 and thick waist seal, and thick waist seal is a plain modification. 2. Faceted waistband with many individual facets. 3. Polished waistband is a smooth and shiny decoration. . Underlay: Facet at the top of the diamond pavilion. The purpose is to avoid damaging the diamond museum. If the bottom tip is too big, it will leak light. There are the following possibilities: sharp or not, very small, small, medium, slightly bigger, big, very big, very big. Generally speaking, medium to pointed or none is a good range. That is to say, you can see the octagonal outline under the magnifying glass of 10X, but you can't see it with the naked eye until there is no bottom tip. Polishing: Evaluation of the last process of diamond polishing. Divided into surface polishing and symmetry. . Grinding is mainly to judge whether there are obvious wheel marks or burn marks. The evaluation of polishing is excellent, very good, good, average and poor. . Symmetry: one of the contents of cutting evaluation. The evaluation is divided into large symmetry and small symmetry. Large symmetrical defects have no significant effect on the appearance of diamonds, while small symmetrical defects have little effect on the aesthetic feeling and value of the appearance. The main symmetry defects are: unsmooth outline of waist rib, eccentricity of desktop, eccentricity of bottom tip, wavy waist rib or inclined desktop. GIA diamond grading system is divided into excellent, very good, good, average and poor. Fluorescent reaction: Fluorescent reaction refers to the reactive color light produced when diamonds are stimulated by external energy, usually under ultraviolet radiation. According to its intensity, it is divided into five grades: none, weak, medium, strong and very strong. Weak does not record its fluorescence reaction color.
It is a natural phenomenon that diamonds have fluorescence. Blue fluorescence can enhance the brightness and whiteness of diamonds, while yellow fluorescence may reduce the whiteness. Therefore, fluorescent diamonds also depend on what kind of light. Diamonds with blue fluorescence will appear whiter than diamonds without fluorescence in the same color scale, and there will be a little more blue light when fired, but it depends on the size and fluorescence intensity of diamonds. When determining the color of diamonds internationally, it is necessary to deduct some scores of blue fluorescence whitening, that is, if two diamonds are both F-colored and one has strong blue fluorescence, and both are certificates of the same international organization, then it is very likely that the original color of the diamond with fluorescence is higher than that of the other diamond without fluorescence. But yellow fluorescence is just the opposite.
"Most diamonds have fluorescence, usually blue fluorescence, which can be observed under long-wave ultraviolet lamps. According to the GIA standard, they can be classified as none, weak, medium, strong and very strong, and generally lower than weak can be classified as non-fluorescent level. The fluorescence grade of diamonds has a great influence on the price of diamonds with D-G color above 50 points and VS grade above, and moderate fluorescence will affect the price by 5%- 10%. It has a great influence on the price of diamonds with a DEF of 1-2 carats. The stronger the fluorescence, the more colorless the color will be, and it will be clearer under the microscope of 10 times, which will affect the permeability of high-color diamonds. For diamonds below J color, although blue fluorescence can make diamonds appear white, the price will still be 5%- 10% lower and the color will be as low as M color. Fluorescence has little effect on the price. Small diamonds below 20 cents basically do not affect the price. 20-50 points also have a certain price impact on diamonds with high clarity VVS. Because the National Gem Testing Center does not classify and comment on fluorescence, most of the diamonds on the market at present are not specified except those with international certificates. However, because most diamonds are imported, the price follows the pricing standards and market demand of the international market, so many large diamonds with strong fluorescence also sell the same price, which is a loss for consumers and unfamiliar operators. " The above is an analysis of the influence of fluorescence on price by an insider. However, with the international certificate, moderate blue fluorescence is the default range limit that the industry can bear. The price scale has been relaxed a lot, and it will basically be lower than the price difference of 5%, except for collectible carat diamonds. Weak fluorescence is not much different in price. The reason may be the change of transaction procurement mode. . . But strong fluorescence is not enough, and the price will be greatly affected. Moreover, similar yellow fluorescence will affect the fluorescence of diamond color and also have a certain impact on the price. Clarity characteristics: the internal characteristics of some natural diamonds, such as small crystals and cloud-like inclusions, can only be proved by further observation under the microscope; Characteristics: There are many kinds of diamond inclusions, such as crystal, pinnate crack, cloud, needle tip and internal particle. Additional inscription: according to your requirements, you can engrave the brand H& of the diamond or your own private letter on the waist line of the diamond, which, together with the number of the diamond appraisal book, will become the unique symbol of this diamond (eight hearts and eight arrows will be engraved with the "H&: A" symbol). Not engraved does not mean that there is no H &；; A, it should be a question of payment. The so-called "eight hearts and eight arrows" is a perfect cut, a perfect diamond, which is purely irresponsible speculation by merchants and misleading consumers. There are seven cutting ratios that determine the quality of diamond cutting, including: table width ratio, crown height ratio, waist thickness ratio, pavilion depth ratio, bottom tip ratio, full depth ratio and crown angle ratio. The so-called "eight hearts and eight arrows" means to control the ratio of platform width and pavilion depth in the seven proportions within the prescribed range, and not to emphasize the other five proportions. As long as one of the remaining five cutting ratios fails to meet the standard, the brightness and fire color of the diamond will be seriously affected, and it cannot be called good cutting, and its value will be greatly reduced. Therefore, "eight hearts and eight arrows" does not mean high-quality cutting. If not, the above additional text will not be marked. . . The picture below shows the GIA digital lettering on the diamond waist. . . Remarks Notes describe some features that cannot be included in the above data or need not be marked on the attached drawings, such as: 1, wood grain or wood grain lines: unless there are colors, reflections or whitening, wood grain lines are usually not regarded as including features and are not drawn on the attached drawings. According to the obvious degree of its appearance, the grains are divided into (1)NIL; (2) slight; (3) The doctrine of the mean is easy to see; (4) It is obviously equal to Grade 4, and only obvious crystal grains are recorded in this column. For example, the surface grain is not shown (the surface grain is not shown in the drawings). The internal grain lines are not shown (the internal grain lines are not shown in the drawing). 2. Not depicted in the attached drawings. For example, minor details of polishing are not shown. Additional stitches are not shown (in addition, some pink inclusions are not shown in the drawing). 3, the main proportion, angle or symmetry is not good. For example, the crown angle is greater than 35 degrees (crown angle is greater than 35 degrees).
Classification table of national standard diamond cutting ratio
Grade/measurement items are generally good, very good, very good and average.
Platform width ratio ≤ 50.051.0 ~ 52.053.0 ~ 66.067.0 ~ 70.0 ≥ 71.0.
Crown height ratio ≤ 8.59.0 ~10.51.0 ~16.016.5 ~18.0 ≥18.5.
The waist thickness ratio is 0 ~ 0.51.0 ~1.52.0 ~ 4.55.0-7.5 ≥ 8.0.
(extremely thin) (thin) (medium) (thick) (extremely thick)
Pavilion depth ratio ≤ 39.5 40.0 ~ 41.041.5 ~ 45.0 45.5 ~ 46.5 ≥ 47.0.
Depth ratio ≤ 52.5 53.0 ~ 55.5 56.0 ~ 63.5 64.0 ~ 66.5 ≥ 67.0
Crown angle ≤ 26.5 27.0 ~ 30.531.0-37.5 38.0-40.5 ≥ 41.0
The above table is the national standard diamond cutting ratio table. . . You can compare the standards of GIA. . . There are certain differences. . .
The online price of this diamond is 4000-4500. If it is a shopping mall, it may reach 8000- 10000.