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.
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
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 =
3 CT = 9.4 mm
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.
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.
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.