Size and weight of diamonds: carat tables for stones of different cuts

You don't need to be a jeweler with years of experience to learn how to determine the carat value of a diamond. A general knowledge of the measurements is enough to find out how many carats are in any real diamond you have purchased if you suddenly have doubts about the integrity of the seller. And the diamond carat table will tell you what a diamond looks like if its weight is accurately determined to be 1 carat, and the sizes of diamonds of the corresponding weight.

Why this particular unit of measurement, why are stones not measured in grams?

The fact is that in the old days, or rather in the Middle Ages, there was only one way to accurately measure a small precious stone. For this purpose, we used the seeds of the acacia Ceratonia siliqua. Therefore, the word “carat” has taken root in their relation. They are unique in that they have almost the same mass - 0.2 grams. However, it fluctuated slightly around this figure, and subsequently the value of this unit differed slightly in different countries. And only in 1907, in Paris, the first international definition of how many grams are in a carat was approved - 0.2.

In fact, the mass of minerals in jewelry is measured in grams too. But usually this unit is used for less expensive stones that are not precious. So, about malachite weighing 5 carats, they will rather say that it weighs 1 gram. But no self-respecting jeweler would dare to describe a diamond, for example, 3 carats as “0.6 grams”. This is how it happened with these masters of their craft.

Diamond carat chart by size

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Moscow city,

LLC "CAPITAL DIAMOND"

Cost of gemstones depending on weight

Of course, the more a sample weighs, the more it costs. This is one of the main criteria for evaluating it, along with cleanliness.

If we talk about a mineral such as diamond, then according to the number of carats it is divided into 4 groups:

  • diamond chips (up to 0.010);
  • small (up to 0.029);
  • average (from 0.030 to 0.990);
  • large (over 1,000).

The price increases (or decreases) greatly depending on the group, but, of course, within the same category the cost of copies can vary significantly. Moreover, the price of each unit of mass in especially large diamonds, for example, 9 carats, is much higher than in small ones (less than 0.5 carats). In this they differ, for example, from gold, where the cost of one gram in a kilogram is the same as that of an individual gram.

Large diamonds (more than one carat) are one of the safest investments in the world. Such an investment has many advantages - a diamond, say, 3 carats can be quickly sold, it is easy to store and over time it will not depreciate or lose its properties.

With smaller or larger diamonds the situation is different. Small specimens are not particularly in demand, as they are common, but they can also have their value. In addition, experts predict that in the next 20-30 years, diamond deposits will dry up, and this mineral will increase in price.

As for large stones, if you come across a particularly large diamond, 10 carats or so, keep in mind that it will be difficult to sell. After all, it costs a lot, and the demand for such things is not so great. But still, it can become an excellent “savings book” for the future.

Diamond characteristics: 4 C gradation

There are several types of characteristics when it comes to a cut diamond.

European 4 C gradation:

  • Cut-cut;
  • Clarity - purity;
  • Color – color;
  • Carat – weight, calculated in carats.

Diamond, being a natural creation, contains inclusions, microcracks, and graphite. The content of other chemical elements gives it a unique shade. There are blue, rare pink, yellowish, brown colors. Black diamonds have become very popular in the last decade. But the most expensive color of a crystal is the absence of color.

The highest rating is complete transparency without shades . The presence of blue or pink must be recognized by a panel of experts to confirm the uniqueness status of that shade.

The paradox of the assessment is that, despite the most advanced diagnostic methods, the only tool for determining the characteristics of a stone is considered to be a 10x magnifying glass - everything that is not visible with 10x resolution is considered non-existent; as well as the eye and instinct of the appraiser.

The European gradation of purity (number of inclusions) has boundaries from F (Flawless) - impeccably clean to SI1, SI2 - defects that are very easily noticeable with a magnifying glass. With appropriate lighting, they can be seen with the naked eye across the platform.

Cuts come in round and fancy. The shape is determined by the girdle - a girdle separating the top (“crown”) and the bottom of the processed crystal. The most popular, providing maximum refraction, is the round cut, which has 57 facets. Often, a cutter, wanting to maintain maximum weight of the finished product, uses fancy shapes - “oval”, “marquise”, “pear”.

Diamond Clarity

The clarity scale varies from 1 to 12. For Kr17 diamonds used in jewelry, the optimal clarity groups are 2 and 3. For Kr-57 up to 0.29 carats these are groups 4 and 5, and for larger diamonds with 57 facets - 4-6 .

It is important to consider that the groups have a fairly wide range. Therefore, do not rush to conclusions if you see a cleanliness class that is too “low,” in your opinion.

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