Diamond Quality
The 4Cs of Diamond Quality
Recognising the need for standards in the diamond industry, GIA (Gemological Institute of America) developed a universal diamond grading system called the 4Cs - Cut, Colour, Clarity and Carat. The same grading system is used for both natural and lab-grown diamonds.
![](http://www.eclatbyoui.com/cdn/shop/files/Untitled_Panorama1_3_2.jpg?v=1718248470&width=3282)
Cut
Cut determines how well a diamond facets interact with light.
Ideal and excellent cut diamonds allow a large percentage of light to be reflected into our eyes, resulting in optimum scintillation. A poorly cut diamond (too deep/too shallow) allows light to escape. As a result, the diamond will appear dull and lifeless.
![The 4Cs - Cut](http://www.eclatbyoui.com/cdn/shop/files/3_021a83b6-57a2-496b-a0cb-df5b6b880dfe.jpg?v=1718677109&width=1890)
![The 4Cs - Cut](http://www.eclatbyoui.com/cdn/shop/files/3_4a719f92-2099-4ed2-88bb-bfffd1f24ef9.jpg?v=1718685755&width=1080)
Colour
Colour refers to the colour tint or hue in a diamond.
All diamonds have a yellowish tinge due to traces of Nitrogen. The closer the diamond is to colourless, the higher the value of the diamond. Graded on a scale between D (colourless) - Z (light yellow), Éclat by Oui selects diamonds from the D/E/F colour range.
![](http://www.eclatbyoui.com/cdn/shop/files/0610-E6151_1_cb16f655-aaa3-4609-a268-506f3928c05d.jpg?v=1718303560&width=4000)
![The 4Cs - Colour](http://www.eclatbyoui.com/cdn/shop/files/1_f62e045d-d6ef-4baf-bef3-c4758999ad37.jpg?v=1718677191&width=1890)
![The 4Cs - Colour](http://www.eclatbyoui.com/cdn/shop/files/1_c9c3e337-7174-45cb-89a7-450564acf17f.jpg?v=1718685813&width=1080)
Clarity
Clarity refers to the absence of inclusions and blemishes on a diamond.
Inclusions impedes the refraction and reflection of light. Here at Éclat by Oui, we only select diamonds from the VS2+ range.
![](http://www.eclatbyoui.com/cdn/shop/files/0610-E6171_1_fac579ef-560e-43aa-9975-571250a87248.jpg?v=1718303521&width=4000)
![The 4Cs - Clarity](http://www.eclatbyoui.com/cdn/shop/files/2_93292d50-9a14-4793-8f89-b814c4af0451.jpg?v=1718677224&width=1890)
![The 4Cs - Clarity](http://www.eclatbyoui.com/cdn/shop/files/2_637dbd36-38cf-4529-a0f0-d374fb700641.jpg?v=1718685855&width=1080)
![](http://www.eclatbyoui.com/cdn/shop/files/0610-E5980.jpg?v=1718249182&width=4000)
Carat
Diamond carat weight measures how much a diamond weighs.
With all things being equal, a diamond of a larger carat size will cost more. This is because larger diamonds are rarer.