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Diamonds and their grading
The quality and value of a diamond is measured by four characteristics known as the 4 C's. The 4C's are the diamond's Cut, Colour, Clarity and Carat weight. The quality of a diamond is measured by its colour, cut, and clarity. The carat weight measures the size of the diamond.
Diamond carat (ct) is a standard of measure. 1ct .= 0.2 grams. A one carat diamond is commonly referred to as being 100 points, 1/2 carat = 50 points, 1/4 carat = 25 points, etc.
All other things being equal, the greater the diamonds carat weight, the rarer the diamond and the more expensive it is. Although many people equate "bigger" with "better," diamonds of all carat weight have the potential to be lively, exciting, and beautiful. The most important thing is to buy the diamond that's right for you.
A diamond's colour is one of the most important factors in determining its value.
Colorless diamonds are the most desirable since they allow the most refraction of light (sparkle). Off white diamonds absorb light, inhibiting brilliance.
For fancy coloured diamonds - the more intense the colour the more valuable the diamond is, they are graded to their intensity of colour, not lack of it.
The graduations in colour are so subtle that intricate international grading scales are used.
Diamonds are graded into categories defined by letters. The colour range from exceptional whites (categories D, E and F) to tinted colours (categories M to Z). The best way to pinpoint a diamond's true colour is to place it next to another diamond that has previously been graded.
During formation of diamonds, very small particles of non-crystallised carbon or non-diamond crystals can be caught within the diamond. These imperfections are called inclusions and provide each individual diamond with its unique characteristics.
Inclusions may not always be visible to the naked eye, however they do interfere with the passage of light through the diamond. Therefore the fewer inclusions a diamond has, the more valuable it is.
Just like colour, clarity is categorised using an international grading scale. The categories of clarity are based upon the number, size and position of the inclusions within the diamond to be graded. Gradings range from flawless, and internally flawless, through very small and small inclusions, to imperfect.
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OVER 20 YEARS EXPERIENCE in the Australian Jewellery / Gemstone Industry.
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