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The Carat Room

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The Carat Room

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Diamond education

 Fine diamonds are among the world's most coveted gemstones. To determine a diamond's value, experts use the Four Cs—cut, colour, clarity, and carat weight. 

CUT

 A diamond’s overall proportions, as well as the size and position of its facets, make up the cut. The consistency and balance of these can greatly affect how the stone captures light and reflects it back to the eye.


Studies have been conducted to find the optimum proportions of a diamond’s cut so that it has the greatest amount of sparkle. If its cut falls within these parameters, it is considered an ideal cut. Commonly used terms regarding refraction and light:


  • Brilliance—the combination of all of the white light reflected from the surface and the inside of the diamond.
  • Dispersion—flashes of colour you see in a polished diamond. Dispersion is also known as fire.
  • Scintillation—flashes of light you see when the diamond, the light, or the observer moves.


Colour

One factor that determines the value of a diamond is its colour. With the exception of fancy-coloured diamonds, the most valuable diamonds are those with the least color. Although many people think of gem-quality diamonds as colourless, completely colourless diamonds are very rare. Each letter grade represents a range of colour that is determined by a manual process of comparing the diamond to a master set.

Clarity

 A diamond’s clarity is measured by the existence or absence of visible flaws. Tiny surface blemishes or internal inclusions, even those seen only under magnification, can alter the brilliance of the diamond and thus affect its value. 

Carat

 Carat refers to the diamond’s weight. You may also hear the weight of a diamond referred to in points. One carat is equivalent to 100 points, so a 75-point diamond is equal to 0.75 carats. Because they are rarer, larger diamonds have greater value per carat. Therefore, the price of a diamond rises exponentially in regards to its size. 


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