How to identify the grade of diamonds?

How to identify diamond grade

Under normal circumstances, we can only rely on the diamond certificate issued by the corresponding authority to identify the diamond grade, so we are afraid to buy fake diamond rings or diamond rings that do not match the certificate. Then you can go to the corresponding authoritative official website to inquire according to the laser code next to the diamond. Of course, going to those famous jewelry stores will be relatively secure. Of course, in addition to buying a diamond ring that both you and your girlfriend like, it is more important to let your girlfriend know how much you love her and make her believe that you can give her a lifetime of happiness. Of course, if you can put a DR ring on her, this ring needs to be customized by a man with his ID card, and only one ring can be customized in his life, and it has the romantic meaning of "the only true love in life", which represents a man's lifelong commitment, then I think your girlfriend will be happier, more moved and more likely to succeed in proposing marriage.

How to identify the grade of yellow diamond

The different colors of diamonds are caused by different chemical trace elements and the deformation of internal crystal structure during the formation of diamonds. During the formation of yellow diamond, when nitrogen atoms replace some carbon atoms in the diamond crystal (1000 out of every1000 million carbon atoms are replaced), extra electrons will form new energy levels in the forbidden band, which will make the crystal absorb visible light and make the diamond appear yellow.

The description of the color of the white diamond, from D to Z, indicates the degree of symmetry without yellow. Only yellow other than Z can be called gaudy (color). Generally, colored diamond-class yellow diamonds are fancy lights from low to high.

Yellow (light yellow), fancy yellow (colored yellow), fancy strong yellow (rich yellow), fancy deep.

Yellow (dark yellow) is bright and dazzling.

Yellow (bright yellow). Although yellow diamonds are common, they are rare and hard to find. According to the statistics of American Gemmological Association, less than 5% of the yellow diamonds identified by it are bright yellow diamonds. Compared with white diamonds with the same weight and color, the price of yellow diamonds is generally higher than 1/4 to 1/2.

It is not easy to identify and evaluate yellow diamonds with naked eyes. First, look at their light. Only diamonds in the world can shine brightly under the light. At the same time, yellow diamonds are honored as yellow, also called bright yellow and pure yellow, without any gray or red tones. Dark yellow and orange diamonds are far less valuable than yellow diamonds.

In addition, pay attention to the difference between yellow and white diamonds and yellow diamonds. Yellow and white diamonds are dark yellow. Compared with white diamonds with the same weight and transparency, the price is often low 1/5 to 1/4. White diamonds are cheaper than yellow diamonds of the same color.

How do diamonds distinguish grades?

How to classify diamonds, taking buying white diamonds as an example, is mainly divided from four aspects: weight, color, clarity and cutting.

First of all, in terms of weight, how to classify diamonds. The weight grade of a diamond divided by the unit carat. If one carat is calculated in grams, it is 0.2 grams, which is equal to 100 points. Usually 1 carat is the dividing line, and the price of diamonds less than 1 carat is obviously lower than that of diamonds above 1 carat.

The next most important thing is the classification of colors. Diamonds are first divided into colored diamond and white diamonds, among which red, pink, blue and green colored diamond are more precious and rare. The most common ones are white diamonds and yellow diamonds. The purer the corresponding diamond color, the higher the transparency and the higher the price. Under the magnifying glass, there are many colors of diamonds. Take white diamonds as an example. Diamonds with color 100 are rated as D, diamonds with color 99 are rated as E, and so on. Until the color J, white diamonds are still called naked-eye white diamonds, and white diamonds of grade K and below are called non-white diamonds (because their colors are turned yellow by the naked eye).

Diamond clarity is also a standard for how diamonds are graded. The purity of a diamond is only a matter of how many impurities there are in the diamond. If there are few impurities in the diamond and its position is not conspicuous, the diamond grade is high, otherwise it is low. Cleanliness grades are: FL, IF, VVS 1, VVS2, VS 1, VS2, SI 1, SI2, SI3, P/I 1, P/I2, P/I3.

The reason why diamonds shine is mainly after cutting, which is also the problem of diamond cutting. How to classify diamonds is also very important in cutting. The higher the cutting level, the more beautiful and expensive the diamond is. The cutting grades from good to bad are EX, VG, g and p.

How to identify the grade and quality of diamonds

Just look at the diamond certificate.

The colors of diamonds are divided into D, E, F, G, H, J, L, M and N, and the colors are getting worse from left to right.

Diamond clarity grades are divided into FL, IF, VVS, VS and SI, which get worse from left to right.

How can I read the diamond grading certificate?

Let me help the landlord find this.

Because of its unique formation conditions and various beautiful meanings given to diamonds by people, the expensive price of diamonds is directly determined. As people's enthusiasm for diamonds continues, the number of brands of diamonds is also increasing, which also makes many people unable to start when buying. Then we all know that nowadays, in order to prove the authenticity and quality of diamonds, diamond brands usually carry a diamond grade certificate on diamonds, so that when we buy diamonds, we can measure the price according to various references on the diamond grade certificate. Do you know what a diamond grade certificate should look like? Below I will teach you how to read the diamond grade certificate.

Tip 1: check the testing organization of diamond grade certificate; No matter what brand of diamonds we buy and see the diamond grade certificate, we must first understand the testing institution of the certificate. Because the current diamond grade certificate can be roughly divided into two types, including two different appraisal institutions at home and abroad. But now some big jewelry brands, most of which are mainly national testing institutions. Therefore, when we buy diamonds, if the certificate we see is from a national testing institution, we can buy them with confidence. At least this diamond is of good quality. In addition, if it is a foreign testing certificate, it is necessary to understand the testing institution clearly and prevent some unscrupulous merchants from using forged foreign certificates to obtain high economic benefits;

Tip 2: Check the 4C standard on the diamond grade certificate; Each diamond grade certificate is a detailed description of a diamond, which is equivalent to each of our ID cards. So when we check the diamond grade certificate, we can directly check it from the 4C standard of diamonds. First of all, we can check whether the diamond image on the certificate is exactly the same as what we want to buy, and then we can check the clarity and carat of the diamond to see if it corresponds to the real thing. If the material object is the same as the standard on the diamond grade certificate, then we can buy this kind of diamond with confidence.

Tip 3: check whether the diamond grade certificate testing institution is authoritative; The difference of diamond grade certificate is mainly due to the different certification departments. Therefore, at present, the testing standards of domestic testing institutions are mainly national testing standards. Generally, when we look at the diamond grade certificate, if the letter MA is marked on the certificate, it means that the certificate is a diamond grade certificate authorized by the national testing institution. Secondly, if there is a foreign logo on the diamond certificate, such as ICI diamond grade certificate, we only need to distinguish the authenticity of this certificate at this time, because this diamond grade certificate is also very authoritative.

How to identify the grade of pink diamond?

Diamond classification refers to the classification of diamonds from four aspects: color, clarity, cut and weight, referred to as "4C" classification. Diamond classification is a comprehensive evaluation of the gemological attributes and values of diamonds.

1. Color: The grader can classify transparent and colorless diamonds in nature into several grades, and the yellower the color, the lower the grade.

2. Clarity is used to describe the obvious degree of internal and external defects of diamonds. Diamonds with internal and external defects can not be seen with a magnifying glass of ten times are classified as flawless; Diamonds that can be observed by the grader with the naked eye are classified as serious defects.

3. Cutting refers to grading the cutting and grinding ratio and dressing of finished diamonds according to certain cutting standards. Cutting-grinding ratio refers to the relationship between the size, shape, distribution and cutting angle of facets, and the dressing degree reflects the details such as symmetry and polishing.

4. Weight is the most objective evaluation in "4C" classification. Bare diamonds can be directly weighed and evaluated with standard weighing instruments.

How are diamonds graded?

clean

FL is flawless

If it is immanent, the surface is slightly flawed.

VVS 1。 VVS2 contains tiny inclusions (tiny defects invisible to naked eyes).

VS 1。 VS2。 Contains tiny inclusions (tiny defects invisible to the naked eye).

Si1.si2. Small inclusions (invisible to naked eyes)

I1.i2.i3. Inclusions (visible defects)

Second, color.

The color grading of diamonds is divided into 23 grades from English letters D to Z.

D, e and f belong to the colorless range;

G, H, I and J belong to the near colorless range;

K, l and m are yellowish;

Below n is light yellow.

Diamond grading-

Diamonds are known as the "king of gems" in the world because of their highest hardness, crystal clear texture and dazzling features.

It symbolizes success, elegance, loyalty, eternity and innocence, so it is deeply loved by people. Diamonds are the gems in the world at present.

Since the advent of portable detection instruments such as thermal conductivity meter, the most traded gemstones in trade have been used to identify the authenticity of diamonds.

This is a very simple matter, but how to evaluate the quality of a diamond has become the main problem in diamond trade.

The latest national standard GB/T 16554- 1996 "Diamond Classification" stipulates that the factors for evaluating the diamond grade are as follows

There are four, namely, color, clarity, cut and carat weight. These four

Factor is also called "4C" standard, and "4C" is the first letter of four English terms: color, clarity, cut and carat weight.

C, and 4C is an indispensable comprehensive factor to evaluate the quality of a diamond, and it is also a measure for consumers to judge the value of a diamond.

Quasi.

There are all kinds of diamonds in the jewelry market, including pure natural diamonds and irradiated and filled diamonds.

Stone; There are white diamonds (actually colorless, white diamonds on a white background), yellow diamonds and colored diamond, such as

Red, green, blue, orange, etc. ; As far as shapes are concerned, there are standard round diamonds, hearts, ovals and pears.

Diamonds of the same shape. The most common diamond on the market is a white (colorless) standard round diamond, so it is in the "4C" standard.

The classification of color, clarity and carat weight of diamonds only refers to natural white (colorless) to light yellow (brown, gray) series.

Polished diamonds with carat weight greater than 0.2 are classified, while the cut classification is only for standard round cut diamonds or white inlaid diamonds.

(colorless) to light yellow (brown, gray) series, the diamond quality classification is 1 carat ~ 0. 1 carat. The "4C" standard does not apply to colors.

Classification of diamonds, radial diamonds and filled diamonds.

In the "4C" standard, the color of diamonds is divided into 12 grades. The classification method is: pure colorless diamonds are defined as

The highest color pole-extremely white, 100 color, expressed by d, can also be written as D( 100). With the increase of yellow content in diamond,

The color level is gradually reduced to E(99) and F(9

. . . G(97)、H(96)、I(95)、F(94)、K(93)、L(92)、M(9 1)、N(90)

And less than N(90). In the diamond appraisal certificate, the color grade is usually expressed only by English letters. When the color level is lower than n, it is generally

It is considered that the diamond is no longer suitable for cooperative jewelry.

The color grading of diamonds is to compare the diamonds to be graded with the standards by professional technicians in the grading environment of specified standards.

After repeated comparison, the color stone was determined. Or use a colorimeter to scan the diamond to be graded in the visible range, and then

After a series of technical analysis and treatment; The purity of a diamond is its purity. The higher the purity of the diamond, the table

The fewer impurities, defects or flaws, and vice versa.

Objectively speaking, flawless diamonds are rare, and the standard stipulates that 10 times magnifying glass should be used for clarity classification.

The internal and surface defects of grade B diamond were carefully observed. Under this condition, the clarity of diamonds is divided into five main grades: flawless LC,

Very slight defect level VVS, slight defect level VS, defect level SI and serious defect level p.

It is further subdivided into five levels 10 sub-levels. ......

How are diamonds graded?

clean

FL is flawless.