Advice 1: How to determine the size of the diamond

A diamond is rightly considered the king of precious stones. In order to properly assess the size of this Royal stone, it is necessary to relate its weight with the proportions and nature of the cut.
How to determine the size of the diamond
You will need
  • carat scales;
  • - fixed diameters;
  • - caliper;
  • calculator.
There are several ways to determine the weight of the diamondand. The most accurate result can be obtained with the help of special carat weights. One carat is equal to 0.2 grams. The scale division of a carat consists of one hundred units, respectively, the gemstone is weighed to the nearest hundredth. The diamonds, which weigh 0.01 carats, is considered a baby. Depending on the resulting mass of stones are divided into small (less than of 0.29 carats), medium (at least of 0.99 carats) and large (over 1 carat). Diamonds with weight more than 6 carats, are sold, usually through a special procedure – auction.
In cases where the stone cannot weigh, for example, it is installed in a piece of jewelry, its weight is calculated using a special formula – M=(D2) x H x 0,0061. M – mass of the desired carat, D – diameter of the stone, H – its height. This formula is used in the calculation of standard weight of diamonds round cut and has a margin of error within 10 %. If you measured the precious stone has distorted and asymmetric cut edges of the inaccuracy of the formula increases substantially. Another option for determining the mass of a diamond with diameter is a special calculation table. To do this, measure the diameter of the diamond and correlate it with the data table. So the stone having a diameter of 2 mm. will weigh approximately 0.03 carats.
When the mass of a diamond is known, it is necessary to pay attention to other essential characteristics, determining the value of the stone. These include the proportions and quality of the cut. Because diamonds are processed manually, the stones may be of the same weight, but different sizeohms. Depending on the nature of the cut of the diamond can weigh more than the weight at which he looks. Purchasing a copy will be unprofitable, as the cost depends on the weight of the stone, not its size. In order not to pay extra, measure the full height of the diamond with the help of Vernier caliper. Then, calculate the ratio of this figure to the diameter of the stone in percent. For the diamond standard round cut height should not exceed the figure at 62 – 62.5% of the longest diameter.
Another subtlety in determining the sizeand value of a precious stone are the so-called transitional mass. For example, a diamond weighing 1 carat (with a diameter of 6.5 mm. faces) is visually identical to stone 0.95 carats (with a diameter of 6, 3 mm.), and their price will differ by more than half.

Advice 2: How to determine the carat of a diamond

"A girl's best friend – it's diamonds". With the French translated as a brilliant diamond. This stone is a processed diamond having a certain shape, it is also called brilliant cut. Light falling on the jewel, refracted into colored rays, and it seems that he begins to "play" the colored flowers. How to determine the weight of a diamond? A measure of the weight of a diamond is considered carats and is measured in the following way.
How to determine the carat of a diamond
Most often it is done using CTin the relative weight. They help jewelers determine the weight, and,consequently, the value of each diamond. When weighing this precious stone is considered the accuracy to thousandths carat. But weight records are taken into account only two digits after the decimal point, and the third, if not 9, is removed. It should be noted that one carat is equal to 0.2 grams. The smallest diamond is considered to be a diamond weighing 0.01 carats. If the stone is of even less weight, it is called diamond grit. Even though it can be difficult to discern (diameter is 1mm), in jewelry the use of they also find.
The second method, which is used to determine the weight of a diamond is the measurement of the diameter of the stone by using calipers. There are also special tables that show the ratio of the diameter of the stone and its weight. But this measurement is very precise. For example, a stone of 2 mm will have a weight of 0.03 caratand the stone is 5.2 mm and 0.5 carats, and the stone 9.4 mm will have a weight of 3 carats.
Often, we need to know the weight of the stone, which is already in the product, that is enshrined in it and, of course, to get him out of there. In this case, we can calculate the mass of the stone on a specially calculated formula. This formula is suitable for stones standard round cut. But it is important to remember that in this way possible errors. So, the formula looks as follows: M=(D^2) x H x 0,0061. It uses the following notation D-is the mass of the diameter, H is the height of the stone, and M are respectively the desired weight in caratsAh. It should be noted that there is a classification of rocks based on their weight. Thus, there are small (up to 0.29 caratsand up), medium (up to 0.99 carats) and large stones (>1 carat).

Advice 3: How to determine the purity of a diamond

Diamond has always been the king of precious stones. It is believed that jewelry with diamonds bring good luck to their owners. Diamond is produced from diamond by diamond cut. When buying a diamond it is very important to pay attention to its characteristics. As a rule, expert assessment of the value of stone is determined by four parameters. It's carat weight (carat weight), color (color), purity (clarity) and quality of the cut (cut).
How to determine the purity of a diamond
The exact weight of the stone is determined by weighing it on scales or counting formula. The weight of a diamond is expressed in carats (1 carat = 0.2 g).
Basically all diamonds have a color and intensity. Colorless stones are extremely rare and are the most expensive. To determine the intensity and color of the stone and assign a rating, the expert uses reference colors. Color 9-point scale starts with colorless diamonds, followed by a transition with increasing saturation of yellow color. Each color corresponds to a letter of the Latin alphabet. Colors beginning with D (colorless) and ends with the letter Z (yellow). The lower the ratio, the more expensive the stone. Stones with features below Z (brown) are considered fantasy. Assessment of color is the professional expert with standard white lighting, white background and availability standards.
Determining the purityto investigate all internal defects of the stone and also assign it a rating. By purity is considered to be free of defects from the stone. Its characteristics are classified as inclusions (internal defects) or surface defects. The defect is considered internal, even if its release on the surface of the stone, if it cannot be removed by polishing without losing weight. The most valuable diamonds are free of defects. The assessment of the purity of the stone is to the naked eye or with a magnifying glass with 10x magnification. Takes into account only those defects that are visible under this magnification. If they are not visible in the magnifying glass, but found at even higher magnification, they are not considered defects. These rocks are assigned to the highest performance. When assessing the purity of accounted for the amount of defects, their nature, number, location, color of internal characteristics. In some cases, take into account external characteristics.
The final parameter is a characteristic shape of stone (round, oval, etc.) and the quality of cut (the amount deposited of the faces). There is a full cut (57 facets) and the simplified (17 facets). Classic round cut diamonds have 57 facets.
To decipher the characteristics of a diamond as follows:Example: 1 CU 57 – 0,39 – 4/2АРасшифровка designations: 1 CU 57 – one round brilliant with 57 facets
0.39 in – weight of stone
4 – band color
2 – group purity
A – group faceting
There are different evaluation system stones. The most popular system developed by the Gemological Institute of the USA (GIA). Are familiar with it experts from around the world. Also known system, Diamond High Council of Belgium (IDC or HRD), the Scandinavian nomenclature (Scan D. N.) and the system of CIBJO. Russia used the Russian system of assessment (TU 117-4.2099-2002).
Useful advice
Diamonds weighing up to 0,29 carats are considered small. Large stones are over 1 carat.

Advice 4: As in house conditions to determine the authenticity of a diamond

Many owners of expensive jewelry turn to professionals to find out the genuine diamonds that they have. However, to answer this question by yourself. You need to do some fairly simple experiments.
As in house conditions to determine the authenticity of a diamond

Fogging stone

One of the simplest ways to check the authenticity of a diamond lies in the definition of its reaction to moisture. Hold the diamond to your mouth and slowly exhale it. If you notice that the stone fog up for a few seconds, most likely a fake diamond. A genuine diamond has the ability to dissipate heat instantly, so blurred it is almost imperceptible. If you'll see this blurred, it disappears much faster than fake diamonds. In addition, if you repeat this experiment several times, on a real diamond, the result is always the same. Fake stone with each new approach will moisten all the more, it produces condensate.


If you check the authenticity of a diamond on jewelry, pay attention to the metal into which it is placed. Earrings, rings and other jewelry with a real diamond is likely to be made of gold, silver or other valuable metal. Armed with a magnifying glass and check the product for presence of a mark on the sample. If available, the probability that a diamond is genuine is very high. At the same time, you may find the inscription CZ (cubic Zirconia), which means that the diamond is of synthetic origin.

Natural defects

Real diamonds usually have an ideal composition. Look closely at it with a magnifying glass. If you see specks of extraneous minerals or small color changes, the probability that a real diamond is very high. Synthetic diamonds are grown in the laboratory, they do not have these defects, because are made in a sterile clean. However, the absence or presence of such defects can not be the determining factor. Even real diamonds can be perfectly clean. Be sure to conduct additional research.


If you have a fairly large stone, you can determine its authenticity by checking its refraction. Pick up a newspaper and look at it through the diamond. If you will be able to read printed text, or at least see him with the big distortions, to be sure, this is a fake diamond. Genuine diamond very strongly refracts the light, so to see anything specific for him is almost impossible, unless prepared in a special way.


Real diamond is a very hard material, it is quite difficult to break. Heat the stone using a small fire for 30 to 40 seconds, then quickly dip it in a glass of cold water. If the stone is made of glass or quartz, it is quickly covered with cracks.

Advice 5: How to determine a diamond's authenticity

Diamond is always more valuable than other stones. So in search of cheaper alternatives appeared a lot of simulations: cubic Zirconia, rhinestone, moissanite, sapphire, etc. it is usually difficult to understand where the real diamond, and it cheap fake. However, there are several simple ways that will help to dispel or, alternatively, confirm your doubts about the authenticity of a diamond.
Guarantee of authenticity of a diamond can only give expert
You will need
  • magnifier 6-fold increase
Reliable conclusion about the authenticity of the diamond can give the expert laboratory that conducts comprehensive diagnosis of the properties of precious stones. Specialists-gemologists to evaluate the diamond in terms of color, clarity, cut quality, thermal conductivity, fluorescence. In the case of the studied stone is indeed a diamond, it's attached to an expert opinion. This document, the owner of the diamond can retain as proof of its authenticity.
In many cities there is still no Gemological laboratories, but to obtain at least minimal information about the authenticity of a diamond it is possible at home. With a magnifying glass look carefully at the jewelry: real diamond, often embodied in the product so that it is easily viewed at the bottom face. In addition, on the lower faces of the diamond under any circumstances you will not see the mirror coating. Otherwise, the stone is a fake.
Examine the appearance of the stone for any visible chips, pitted faces, the presence of internal inclusions. The diamond is the smallest allowable inclusions, all faces and edges should be smooth, clear, no chips or rough edges.
Please note the stone's sparkle. Diamonds shimmer in all the shades of gray, whereas rainbow glitter should give you an idea about fake.
One of the unique properties of diamond is its high thermal conductivity. Breathe on the stone and immediately examine through a magnifying glass its surface. On the imitations of diamond (glass, quartz, zircon) remain vague traces of a genuine diamond of such traces should not be.
If the counterfeit is of low quality, it is easy to determine by rubbing the stone with sandpaper. Due to the unique hardness of this diamond from this contact will not be over. Similar way of testing – a stone to scratch the glass surface. A fake will not be able to leave her scratches, while diamond can handle this easily.
Loose diamonds, place on a sheet of paper with printed text. Through glass or crystal you can clearly see the letters, and the refraction of light diamond of the text will be indistinguishable. Another similar method: direct a beam of light from a small led light on the stone. If, looking from the opposite side, you will not detect the light beam, and instead will notice a light outline around the edge of the stone, then you have a genuine diamond.
Check for conductivity excellent resistance to such a simulated diamond like moissanite.
It is not recommended to determine the authenticity of a diamond by using a variety of scratching surfaces, because even a genuine stone can get damaged.
Useful advice
When you purchase jewelry or loose diamonds please note the cost of the acquisition. Suspiciously low price – an occasion to reflect on the authenticity of the proposed stone.

Advice 6: How to identify a real diamond

All kinds of imitation and fake diamonds there are nowadays not so rare. Of course, the final conclusion about the authenticity of a diamond can be given only by a qualified technician. But if there is an urgent need to perform a preliminary study of the properties of the stone at home.
How to identify a real diamond
You will need
  • - magnifier 10-fold increase;
  • - butter;
  • - hydrochloric acid;
  • - quartz lamp;
  • - sandpaper or needle;
  • newspaper.
Look closely at a piece of jewelry, in which is fixed the stone for maximum brilliance and fire a diamond, usually placed in the open frame. This mounting method also allows you to easily examine the bottom edge of the cut diamond. Mirror coating bottom faces, a sure sign of forgery.
Diamond conducts heat well. To check this property, put the examined the stone in a cold place. Then breathe on it and watch through a magnifying glass over its surface. On a real diamond you will not see any hazy residue, while the imitation of diamond will fog up from your breath.
Diamonds can stick to some types of fats. Test with butter: dip the stone into it and attach to the glass surface. A real diamond will stick to the glass.
Even the strong acids and their mixtures have no impact on the diamond. Drop check the rock in hydrochloric acid and rate its appearance. Synthetic fakes will have traces of acid, and a genuine diamond will remain intact.
One of the important properties of diamonds is a luminescence in ultraviolet rays. Proper lighting can be found, for example, in the disco or under a conventional quartz lamp. If under the action of ultraviolet radiation at the stone appears blue or yellow-green glow, then before you a real diamond. If the glow a different color (or completely missing), this can be a feature of this diamond, and a sign of forgery. In any case, authentication requires additional research.
Check the stone for hardness: try to scratch or RUB it with something sharp (needle, sandpaper). The unique hardness of diamond to protect it from such superficial damage, therefore, genuine diamond marks your manipulations will not.
A magnifying glass to examine the appearance of the stone. Many small chips, micro-scratches, pitted face should give you an idea about fake. To determine a real diamond, you can also by the presence of the internal defects: black dots are graphite, fine bubbles, light points. Imitate diamond, as a rule, such inclusions do not have.
Pick up a newspaper and put it on loose diamonds. Now try to see the printed letters through the stone. Crystal or glass will allow you to do this without difficulty, whereas a real diamond refracts light so that makes the text indistinguishable.
A popular method of determining the authenticity of a diamond to put it in a glass of water. Supposedly the stone become invisible in the water. But this is true only for clear and colorless diamonds. Therefore, the reliability of such tests is small.

One of the newest high-tech simulators of diamond moissanite. This stone is able to successfully pass many of the tests listed above. The only way to detect a fake is to hold the stone for a few minutes over the fire. The result moissanite will turn green. To put your jewelry such verification is only in extreme cases, otherwise you run the risk of hopelessly to ruin it.

Advice 7: How to distinguish a cubic Zirconia from a diamond

Today you can buy a piece of jewelry, adorned with precious stones, with almost any amount. But not every buyer knows about diamonds and cubic Zirconia, so there is a risk to face with fraud, becoming the owner of a skillfully executed forgery. What are the differences between these stones and how to tell the difference without resorting to laboratory tests?
How to distinguish a cubic Zirconia from a diamond
First of all, the quality of the stone and it will tell you the cost of jewelry. The price of the product with cubic Zirconia will be incomparably lower than the cost of a ring or a necklace with diamonds. There are other issues that indicate the difference between the stones, in addition to information about how much is a piece of jewelry.

The nature of the cubic Zirconia and diamond

The cubic Zirconia and diamond have different nature. Cubic Zirconia stone synthetic origin, while real diamond is a natural mineral, which has undergone a special treatment. And if diamond is required to cut a diamond, the cubic Zirconia is synthesized from zirconium dioxide. This man-made miracle person is different from the natural diamond is the composition, chemical formula, characteristics. So two stones resemble each other only superficially.
Popular belief States that if you breathe on the cubic Zirconia, it will instantly become covered with steam and turbid, and the diamond will remain brilliant.

Cubic Zirconia slightly heavier than a faceted diamond. To determine the weight of the stone in jewelry is not easy, so the professionals determine the authenticity of the diamond using x-rays. Precious mineral can pass through these rays.

The difference between diamond and cubic Zirconia

When choosing jewelry in a jewelry store look closely at the faces of beautiful stone. The cubic Zirconia they are a little rounded, smooth, and diamond – direct, pointed and perfectly smooth.

In addition to the facets on a diamond's authenticity will indicate the particular Shine – natural mineral it will be brighter than ordinary cubic Zirconia. We can also conduct a simple test with stones. Diamond is famous for its unique hardness, after processed with the diamond on the glass, you can see the groove on the surface. While cubic Zirconia this track will not leave.
There is one test swipe across the diamond sandpaper marks on the surface will remain, a cubic Zirconia from such impacts can be damaging.

Worth a look at the source of light through the stone. The diamond has special properties – radiance, and if you look through the sun's rays are refracted. Faces of a mineral similar to mirror and cubic Zirconia will not reflect the sun's rays. He will let them go through me.

Be sure to ask in store certificates for products. But at home, you can drop the diamond in a glass of regular water – it should not be seen in the liquid, so it is transparent. Artificial cubic Zirconia this property can not boast.
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