Diamonds vs. Brilliants

Find out more about YES diamonds. We offer jewellery with diamonds decorated by an exceptional frame and unique design.


There are global criteria that objectively define the value and specification of every diamond. They are described as the rule of Four C’s: Carat Weight, Clarity, Colour and Cut. The estimate that is decisive regarding the value of seemingly identical stones with a similar weight is performed according to this rule. The Rapaport Diamond Report is a price list created on the basis of a detailed diamond market analysis.

It is this standard that the estimated value of diamonds is based on. Every renowned jewellery shop offering diamonds should have a certificate for every stone. In this way it guarantees to its customers that the stone is authentic and of the highest quality. The stone value is additionally raised if it receives a certificate from one of the independent international gemmological institutes. The most prestigious ones are IGI, GIA and HRD.

Carat weight

The weight expressed in carats. One carat is 0.2 grams. One carat is divided into 100 points, which means that a 20-point diamond will weigh 1.20 carats, usually marked as 0.20 ct. The name of this unit of mass applied to gemstones has its roots in ancient Greek in which the word keration means a Mediterranean plant. Its seeds, very small and hard, were known for their extremely even, almost identical weight and used as weights.

The biggest diamond ever to be found is called the Cullinan. Uncut it had a weight of 3106 carats and it was split into 105 stones. In most cases during the cutting process a diamond loses around 50% of its weight. The Cullinan diamond lost as much as 65%. The biggest diamond cut from it was the Star of Africa weighing 530 carats. This diamond decorates the British Royal Sceptre.


It is defined according to a special scale. Most diamonds have a delicate brownish or yellowish colour. The rule is that the whiter a diamond is the more value it has. The exception can be stones with very intense colours. “A fancy colour” description is used for the stones which nave a natural colour, with no artificial dyeing technology used (HP/HT method).

H-colour diamonds (white), which usually have the SI clarity, are very popular. I- or J-colour diamonds (soft muted white) are also often chosen. Customers for whom the colour of the stone is most important usually prefer colour G (delicate white). It is usually combined with VS clarity.


Gemstones’ inherent features are microscopic inclusions also called “infixions”. They are created in the process of gemstones being formed. Multiple zooming allows defining the clarity class. The fewer inclusions a brilliant has the more valuable it is. Perfectly clear diamonds are a rarity. The particularly popular ones are those classified in the SI category – small inclusions (usually combined with colour H).

If the clarity is categorised as SI or higher, “infixions” are usually invisible to the naked eye. Customers who put the stone weight behind its clarity will probably decide to buy a stone with the clarity classified in the VS category – very small inclusions (often combined with colour G) or higher.


Diamonds become diamonds thanks to a brilliant cut, which should make the stone look even better and ensure a good optical effect. A full cut consists of 58 surfaces (56 facets, a table and a culet). On the market there are also stones that retain as large weight of a pure diamond as possible after they are cut. These can be identified by thick girdles and small facets.

A bad cut makes a diamond lose even half of what it is worth. Evaluating the cut is the most difficult part of pricing a stone. It is also the most important part. It is the quality of the cut that largely decides about this unique feature of a diamond – its shine.


Shine, next to carat weight, colour, clarity and cut, is an additional feature of diamonds. In 2012 we introduced the YES Ideal Diamond® which dazzles with its exceptional shine. Thanks to a special cut, it makes every ray of light glow like a marvellous flame. Only the greatest masters of the lapidary art can cut it. It has 82 facets arranged in an optimum position towards one another which perfectly refract and reflect rays of light.

As a result, jewellery with a YES Ideal Diamond® enraptures with its ideal shine. The more intense shine of the YES Ideal Diamond® is confirmed by the measurements that use the BrilliantScope® objective technology. It is also proven by the special GemEx Certificate. This diamond decorates the most valued YES designs: Metropolitan, Éternel, Amore and Stella.


YES confirms the quality of every gemstone as well as Namiko pearls with a special YES Certificate. Additionally, larger diamonds have a certificate from one of the two most renowned independent gemmological institutes in the world: the International Gemmological Institute (IGI) and the Gemmological Institute of America (GIA). Both IGI and GIA certificates are a kind of peerage for a stone. They raises its value as a capital investment and increase the prestige of the jewellery itself.

Due to the long procedure necessary to analyse stones before issuing a certificate and due to its costs, these certificates are used in the case of stones with higher value. Every YES customer has a guarantee that our company treats all the information included in the YES Certificate with the utmost care and honesty and can be sure of its credibility.