# Advice 1: How to determine the carat of the diamond

Carat diamondand or, more simply, its weight is determined in various ways. Each method has its accuracy and features. Tell me more about the methods for determining the weight of diamonds there are and what each provides the accuracy of the proposed methods.
Instruction
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All diamonds are measured in carats and one carat equals 0.2 g. The smallest are considered diamonds weighing 0.01 carat, they are also used for making jewellery, but to treat them can be difficult, as the diameter of the stone is equal to about 1 mm.
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Measuring scale CT has one hundred divisions, and an inexperienced person will be difficult to distinguish a diamond weighing from 0.3 carats of diamond weight of 0.4 carats. Professionals use special microbes, they help to determine the exact weight of the stone. If you want to calculate the approximate weight use the arithmetic formula, just keep in mind that it applies only to diamonds with round cut.
The formula is: Mass=(Diameter^2) x Height x 0,0061
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Usually it is calculated weight in case of tie stones, it means that the stone is inlaid in ukrasheniya, and extract it from there is not possible. Of course, in this case you can judge the approximate weight of a diamond. Also the approximate weight of the stone you can tell by its diameter. The scheme is as follows:
0.1 carat = 3 mm.
0.3 carat = 4.3 mm
0.5 carat = 5.15 mm
1 carat = 6.5 mm
1.5 carat = 7.4 mm
2 CT = 8.8.mm
3 CT = 9.4 mm
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All the diamonds according to their weight can be divided into three categories, namely: small, medium and large.
The small diamond stones from 0.01 carat up to 0.29 carat. Prices on stones of this category, a steady, usually depend only on the weight of the stone.
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Medium diamond stones weighing from 0.30 to 0.99 carats. The average price of diamonds is also calculated from the assessment tables, as well as global prices.
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Large diamonds are stones weighing more than 1 carat. Such stones are likely to have its own individual price, which will depend on the purity and color of the diamond, its rarity, origin, etc.

# Advice 2 : 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.
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.
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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.
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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.
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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 3 : 1 carat is how many grams

Gemstone weight is not measured in grams. The conventional unit for determining the value of diamonds for many centuries is the CT - value, which throughout history has varied from 0,188 grams to 200 milligrams.

## The formation of the carat as the international unit of measurement of weight

Precious stones and other gifts of nature are measured in carats. The roots that gave rise to the definition, go back centuries. One of the common opinions States that the diamond weight was originally measured in seeds of acacia. This plant grows in the Mediterranean. The pods of a shrub called "little horn," and in the Greek pronunciation is "carat".

Another assumption indicates that coral tree. The weight of its seeds is approximately equal to the weight of the average diamond. The Romans also measured the jewel seed plants. 24 grain was used as weight.
Greece minted coins whose weight corresponded to 24 seeds of acacia.

Measure in carats of the precious stones, the share of gold in the alloy and pearls. To measure the value of the latter and appreciate it was quite difficult. It depended on many factors. Mattered even batch cultured pearls.

## Carats and grams

All this was only an approximate value. They can vary from area-grown tree, from the pods and even from humidity. Later, Karat began to measure in grams, but then it was not officially established value, how much weighs one carat. Even within a single country was recorded bounds from before 0,188 0,213 grams.
When trade became global, it became necessary to come to a single measurement value.

First made an attempt of the Paris merchants. At the meeting of the Precious chamber of 1877 was offered by the official measure: one carat corresponded 0,205 grams. However, the world community has not supported this initiative. Later, in 1907, took place the General conference in Paris, which was engaged in the consideration of a single system of weights and measures. One of the subpoenas was to determine the official values of karats. Now 1 carat is equal to 200 milligrams.

However, not all countries supported the establishment. The French had to be active in attracting the world community to create benchmark measures. Resolution in some countries were accepted, others were canceled, the third is simply ignored. But by 1914 the French had already gained weight in the eyes of the representatives of many countries. And finally, the action was a success. In 1930 finally established, the proposed measure of weight of precious stones and has become an international unit of measurement.

# Advice 4 : What is measured in carats

Carat is a unit of mass that emerged in the middle East and known in jewelry since ancient times. To this day it is used to measure the volume of gems and purity of gold. Share a carat are expressed in fractions.
CT – disambiguation, indicating a measure of weight, equal to 200 milligrams, or 0.2 g. Often in carats to measure precious stones and gold. The word carat is of Arab origin ("kirata") and originally meant the pod of the carob tree, whose seeds, in ancient times was used as a measure of mass.

## Carat as a unit of measurement samples

The British carat – unit of measurement of the percentage of gold in jewelry, bullion, coins, equal to 1/24 the mass of pure substance present in the total mass. As a rule, is used for marking purity of gold and is denoted by a capital Latin letter K. as an example: 583-I test corresponds to a 14KT gold, 375-I – 9K. The purest gold is 24K.
The seeds of the carob tree are homogeneous and have the same weight, and therefore became the unit of measurement.

Good to know that gold is soft and very often combined with the so-called "filler metals" (such as: silver, copper, Nickel). White gold, the shade obtained by adding silver, palladium or platinum, will have more carats than the one that fused with Nickel.

## A girls best friend

To measure the mass of gemstones and pearls used metric carats. It was installed the 4th General conference on weights and measures in 1907 and came to the Soviet Union in 1922. Unlike the British, it is abbreviated as "ct" (in Russian language – "CAW"). The abbreviation "ct TW" means total weight of multiple diamonds in jewelry.
The scale of measurement carat is divided into one hundred units, so the gemstones can be measured with an accuracy of up to 0.01 carats.

It should be noted that different stones of the same weight will not necessarily have the same size, because some of them have different density. So, two diamonds of the same carat weight can cost differently, depending on such additional factors as cut, clarity, color. But in General, the larger the carat, the higher the price – the large diamonds are quite rare.

In order to calculate the volume of a standard round diamond, mounted in jewelry, apply the formula M=(D^2) x H x 0,0061, where D – diameter, H – height, M – mass in carats.

There is another way: the approximate weight of a diamond can be calculated by the table diameter ratio and CT.
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