The 4Cs Diamond Grading Tutorial
Diamonds are graded according to a universal grading system called the 4Cs: Cut, Colour, Clarity and Carat weight. This determines a diamond’s value and its unique set of characteristics.
The creation of the Diamond 4Cs meant two very important things: diamond quality could be communicated in a universal language, and customers would know exactly what they were about to purchase.
Understanding the basics of the 4Cs will help you make an educated and informed decision when purchasing a diamond.
A diamond’s weight is measured in carats – the standard unit of weight used for gemstones. 1 carat = 0.2 grams, or 200milligrams. The higher the carat, the more rare and valuable the diamond.
Diamonds occur in all spectrums of colours. White diamond range from colourless – the purest, rarest and most valuable – to varying degrees of yellow. They are graded on a colour scale from D (colourless) to Z (heavily tinted).
A diamond’s clarity is a measure of the presence of natural inclusions or imperfections found in a diamond. These are formed when the diamonds were formed billions of year ago, as a result of carbon exposed to tremendous heat and pressure deep in the Earth. These natural inclusions are unique to each diamond and are thought of as nature’s fingerprint.
The cut of a diamond is the most important factor in determining a diamond’s fire (the scattering of white light into all the colors of the rainbow), brilliance (internal and external white light reflected from a diamond) and scintillation (the amount of sparkle a diamond produces, and the pattern of light and dark areas caused by reflections within the diamond).
There is a 5th C, which stands for Confidence. This comes from knowing you are buying your diamond through a reputable source and that the diamond was obtained ethically. Diamonds 27 only stocks GIA graded diamonds, giving you the peace of mind and confidence that your diamond was obtained through ethical measures.