• Diamonds are found in almost every colour of the rainbow, but white-coloured diamonds remain the most popular.
  • There are more than 20 subtle grades of colour, identified in alphabetical order from D-Z.
  • Variations are so slight that colours must be graded by an expert under controlled lighting conditions and compared against a master set for accuracy.
  • Those at the upper end of the scale will be more expensive, as they are rarer. However, they are difficult to discern with the naked eye
  • Naturally-occurring features - known as inclusions - provide a special fingerprint within the stone. Usually invisible to the naked eye, these tiny marks are minerals or fractures which appeared while the diamonds were forming in the earth
  • The number, type, colour, size and position of these inclusions can affect the value of a diamond
  • Many can only be seen by a 10-power magnification loupe or stronger
  • Flawless diamonds are rarer and thus more expensive. Small inclusions do not affect the beauty of brilliance of the diamond however

(click on colour to find other gemstones and jewelry)
  • Carat is often mistakenly used to refer to a diamond's size, but it is actually a measure of weight. One carat (equivalent to 200 milligrams) can be divided into 100 "points". A 0.75 carat diamond may also be described as a 75-point or % carat diamond
  • Larger diamonds are found less frequently in nature, so they can command a significantly higher price. For instance, a one carat diamond will cost more than two Vz carat diamonds of equal colour, clarity and cut
  • There are specific "cut of weights" that command a higher price: For instance a 1 carat diamond will command a relatively higher price than a 0.95 carat diamond if all else is equal
  • Cut is the shape and cutting style of a diamond.
  • The cut, polish and proportions of a diamond will determine its appearance.
  • The shape of a diamond is a matter of personal taste, with the round brilliant cut the most popular. Other shapes are the asscher, cushion, emerald, heart, pear, marquise, oval, princess and trilliant

  • At least 13 factors affect diamond value, including fluorescence, table percentage, symmetry and other crucial details.
  • The most important factors when determining the quality of a diamond are known as the 4Cs.These are the diamond's carat weight, its cut, its colour and its clarity.
  • The key thing to note is that no one C is more significant than another. A particular combination of the 4 Cs can be chosen to suit a particular budget, occasion, design or jewellery piece.