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.
Instruction
1
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.
2
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.
3
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.
4
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 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
Instruction
1
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.
2
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.
3
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.
4
Please note the stone's sparkle. Diamonds shimmer in all the shades of gray, whereas rainbow glitter should give you an idea about fake.
5
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.
6
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.
7
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.
Note
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 3: 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.
Instruction
1
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.
2
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.
3
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.
4
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.
5
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.
6
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.
7
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.
8
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.
Note
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.
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