What is the composition of diamond?

What connection is there between a lump of coal and this sumptuous stone that adorns most engagement rings? The composition of diamond

Carbon is the principal chemical element that composes the diamond. In fact, graphite or charcoal, under enormous temperature and pressure, saw its carbon atoms to draw nearer and especially to organize. Connections have been established between atoms creating very strong links between them.

While the structure of graphite is made of sheets (which tend to slide over each other), the structure or diamond is made of atoms which connections between them are directed in three directions.


This difference in the layout of the same atoms explains the differences in properties:

  • – Conduction of current: the graphite is conductive (current flowing between the layers), diamond is an insulator
  • – Heat conduction: the diamond is an excellent conductor of heat, the graphite is moderately
  • – Transparency: as everyone has noticed, graphite is opaque, diamond is transparent.
  • – Hardness: that of diamond is 10 on the Mohs scale (diamond can only be cut by another diamond) that of graphite is 2 on the same scale.

At the compression and processing of graphite over time, impurities may have been trapped in its structure.

Mechanical impurities that may be in the rough diamond, will hinder the path of light rays in the stone and reduce its brilliance. The cutter does everything possible to eliminate most mechanical impurities during the cut.

Chemical impurities, present in the form of some foreign atoms that are found trapped in the structure are themselves popular because they are the ones that give color so rare diamonds: the structure are themselves popular because they are the ones that give color so rare diamonds: Yellow for nitrogen atoms, blue for boron atoms or for titanium atoms.

The price of “the” carat or the price of carat ?

The global reference to which refer the diamond industry around the world to fix the price of carat is the “Rapaport Diamond Report” that reflects the state of the global market.
It contains the diamond carat reference price, classified into 18 tables. Each table corresponds to a weight range of the stone you want to know the price.

Thus, in September, the benchmark price of a diamond weighing between 0.50 and 0.69 carat, clarity G – VS1 is $ Y per carat. If the stone weighs 0.62 carat, the price will be $ 0.62 x Y.

For a stone of 1.20 carat G – VS1, it will search the reference value in Table 1.00 to 1.49 carat. The price is $ X per carat.
But, for the same quality G – VS1, X is two times higher than Y !!!
Because the price per carat of a diamond weighing 1.00 carats to 1.49 is more than 2 times higher than the price per carat of a diamond weighing from 0.50 to 0.69 carat.

This means that in this example, you can have 4 diamonds of 0.50 carat for the price of a 1 carat diamond !!!

Choosing a diamond

Buying a diamond is a major investment and should take all precautions not to make any mistake.

The first step (essential) is to set the budget you want to spend.

Then select the shape of the diamond knowing that round (brilliant cut with 57 facts ) being the most sought after, it is about 20% more expensive than the so-called fancy shapes (princess, pear, emerald, etc …). This is also the cut that gives maximum brilliance to the diamond.

You will then decide if weight is favored (ie size), the color and / or purity.

In the case of a diamond to be set on a mount, commonly used grades are H / SI1 – G / VS1 or VS2 or F / VVS1 VVS2 for high level jewelry.

The colors D and E are often reserved for investment diamonds.

It is important to choose a zero fluorescence to prevent your ring does not surprise you in a room containing a UV lamp.
But do not forget that 20-40% of the price of your diamond depends on the quality of how it was cut (symmetry, proportions, finish). From this quality depends largely radiance and beauty of your stone.

To give the best to its customers, Private Diamond Club selects in the cutting shops of Antwerp, whose reputation is well established, diamonds whose criteria of symmetry, proportions and finishes are excellent or very good.
In all cases, it is appropriate for stones greater than 0.50 carat weight, to obtain the gemological certificate issued by one of three internationally renowned laboratories (HRD, GIA or IGI).

Price of diamond – do not be fooled!

12th of September 2014

investment diamonds



1 – SHAPE : The Round shape diamond or “brilliant” is by far the most popular and the most sold for diamond jewelry but also for a loose diamond as an investment. “Fantasy” cuts are less expensive than round ones, pear shape , marquise, heart, cushion, oval, emerald cut, princess cut, etc…

2 – WEIGHT : The weight of a diamond is expressed in carats. One carat weighs 20 grams and is divided into 100 points. For example, 25 points is 0, 25 carat. Above one carat we no longer talk about points.

3 – COLOUR : Most diamonds are white, transparent or translucent. Grading is as follows: D: Exceptional White +, E: Exceptional White, F: Extra White +, G: Extra White, H: White, I – J : Nuanced White, K – L: Slightly tinted, M to Z: Tinted. The Antwerp Private Diamond Club sells only diamonds with top colors: D, E, F, G, H.

4 – CLARITY : The clarity of a diamond depends on the location, quantity, size, shape and color of inclusions found there. Grading is as follows : FL: Perfectly pure – IF = LC i.e total lack of inclusion – VVS1 and VVS2: Very Very Slight inclusions, VS1 and VS2: Very slightly inclusions – SI1 and SI2, Slight inclusions not visible to the naked eye – P1, P2 and P3: Large and / or numerous inclusion (s) visible (s) to the naked eye. They are called ”Diamonds piqués”. The Antwerp Private Diamond Club sells only diamonds of higher categories, FL to SI.

5 – THE PROPORTIONS: The Antwerp Private Diamond Club sells only diamonds whose proportions are excellent or very good. If the proportions are average or bad, the diamond value is 10% to 15 % less.

6 – THE SYMMETRY: The Antwerp Private Diamond Club sells only diamonds whose symmetry is excellent or very good. If the symmetry is average or poor, the diamond value is 10% to 15 % less.

7 – THE FINISH (crude trace on one or more facets): The Antwerp Private Diamond Club sells only diamonds whose finish is excellent or very good. If the finish is average or bad, the diamond value is 10% to 15 % less.

8 – THE DEGREE OF FLUORESCENCE: The rarest diamonds are those which are not fluorescent. The Antwerp Private Diamond Club sells only diamonds which have little or no fluorescence. If the fluorescence is medium or high, the diamond value is 15 % less.


Before buying a loose diamond or a dimond jewel ask to see a copy of the Certificate of Authenticity (HRD – GIA or IGI ). You should read these eight criteria . If, for example , a diamond of 1.20 carat E VVSI has Proportions , a Symmetry, a Finish that are good, average or bad and strong Fluorescence , this diamond can be worth up to 60 % less than a diamond of 1.20 carat E VVS1 which all criteria are Excellent or Very Good and with No Fluorescence.

Do not be fooled about the price of a diamond because its price is largely determined by the gradation of each quality criterion.

PRESS SERVICE : contact@private-diamond-club.com – Phone : 00 32 (0) 32 27 08 20