17 round shaped diamonds F-VS 0,59 carats
67 round shaped blue sapphire 5,10 carats
White gold 18 Kt. Microscope setting
The 4 C’s
The four factors that determine the value of the diamond are the four C’s which stand for: “Colour”, “Clarity”, “Cut” and “Carat”. Their combination gives to diamonds their own uniqueness and permits to determine their market value.
Shown below a brief description of the characteristics of the diamond and how the four C’s influence the value of the gemstones in wider terms.
De Marchi Gioielli selects diamonds that are able to satisfy the four Cs high standards. We set diamonds from colour F to D, purity from IF to VS2, which proportions optimizes the brightness.
From CT 0,50 provided with an International certificate of guaranty G.I.A HRD, IGI.
A diamond’s colour could be its most appreciable feature even to the naked eye when is well set up on the finished jewel.
Generally the more colourless is the diamond the more the light goes easily through the gemstone, reflecting itself towards the observer.
A diamond’s colour has a remarkable influence on the value of every gemstone.
The more colourless is the diamond the higher will be its value.
G.I.A., HRD, IGI reference.
The cut of a diamond is the parameter which most represents a the ability of a gemstone to reflect the light.
Therefore it determines the brightness of the diamond itself.
When we have an ideal “bright cut” the light enters from the upper section of the diamond and is refracted at a right angle, the light comes out again through the same portion bestowing a remarkable shine and brightness.
A classic diamond cut consists in 58 facets of which 33 situated on the upper section (crown) and 25 on the lower section (pavilion) .
We obtain an optimal brightness when the crown represents a third of the height of the diamond.
The clarity of a diamond is a key factor in order to determine its value.
When a diamond presents no inclusions, as to say there is no visible imperfections even with the help of a magnifying glass to IOX, we are in front of a real rarity.
These diamonds are destined to become, for the most part, certified as an investment.
At the jewelry store far more frequently we find diamonds with little imperfections called inclusions.
The more the inclusions are minimum (or not visible) the more the diamond will result precious and of value.
The carat is the unit of measurement with regard to diamond weight.
It amounts to a fifth of a gram (0.20 g)
Carat is commonly known with the abbreviation CT and represents the weight of a precious stone.
In the following image we show the approximate dimensions of a round-shaped diamond (bright cut) which corresponds to certains carat values.
The carat is another element that determines the final value of a gemstone.
Not only because the value increases with the carat but most of all because the value of the gemstone increases in quite a proportional way with the carat.
In the matter of diamond carat when we talk about gemstones which stand under the carat standards the specific term is “points”. The point of a charat is the hundredth part of a carat (0,002 g).
It is a unit of measurement that indicates small size diamonds.