Understanding the 4C's
Every diamond is characterised by the famous 4Cs: Carat, Clarity, Colour and Cut. The diamond clarity, diamond colour and diamond cut (proportions) are the quality elements which together with the diamond carat (weight) determine the value of a stone. The higher a diamond grades in any of these elements, the rarer and the higher its financial value will be. Each of the 4Cs is equally important and plays a vital role in the appearance of a diamond. Every diamond certificate or grading report will state the grade of each of the diamond 4Cs.
Diamond Carat (Weight)
The diamond carat is the unit of weight for all gemstones. One carat, which has a total weight of only 0.20 grams, is subdivided into 100 “points”. Therefore a diamond measuring 75 points is ¾ carat in weight, or 0.75ct.
The clarity of a diamond is determined by the number, nature, position, size and colour of internal characteristics called “inclusions” and surface features called “blemishes”. These irregularities occur during the formation of the diamond.Diamonds are mostly pure carbon, however, during crystallization other minerals nearby, or even other bits of carbon forming more quickly may become trapped within the mass. These show themselves as the various characteristics which make up the clarity of a diamond (included crystals, feathers, clouds etc).
The diamond clarity is measured on a scale ranging from pure (Internally Flawless – IF) to heavily included (I3). The clarity of a diamond is graded by using 10X magnification under good lighting by an experienced grader. The final clarity grade is determined by how easy the inclusions and blemishes are for the grader to see.
At Congenial Diamonds, we offer diamonds with eye-clean clarity varying from IF to SI2:
Internally Flawless (IF) or Loupe Clean (LC)
No inclusions visible to a skilled diamond grader using 10X magnification.
Very, Very Small Inclusion (VVS1 and VVS2)
Inclusions that are difficult for a skilled grader to see under 10X magnification.
Very Small Inclusion (VS1 and VS2)
Inclusions that are clearly visible to a skilled grader using 10X magnification.
Small Inclusion (SI1 and SI2)
Inclusions that are noticeable to a skilled grader using 10X magnification.
Ideally, a diamond should have no colour at all (colourless), like a drop of spring water. Increasing degrees of body colour are measured on a scale ranging from no colour at all (D) to yellow (Z). Beyond “Z” is the range where the diamond’s colour is vivid and rich, called “fancy colours”, which are very highly priced due to their rarity. Diamond colour grading is done by comparing the diamond under study against a set of diamonds of known colour called “master stones” under either artificial or natural daylight.
The range of diamond colour offered in our jewellery ranges from D to I.
The cut of a diamond is graded by experts in gemological laboratories. The range of grading and certification starts from Excellent, Very Good, Good and Fair. Excellent grade is awarded to diamonds with the highest level of brilliance, while Fair implies poorer light reflection and less sparkle.
The diamond cut can also affect the visual size of a stone. Two diamonds of the same carat (weight) can appear to be different in size depending on the cut.
Fancy Shape Diamond
The diamond cut at its most basic level also refers to the shape of a diamond. Note that the shape does not affect the quality of the stone. The shape is often dictated by the shape of the rough diamond; each rough diamond is cut to the shape which provides the highest yield.
At Congenial Diamonds we offer diamond jewellery set with various shapes to suit individual preferences: