- Calfâ€™s Head Diamond
Diamond cut or shaped to look like a triangle with all three corners cut off, similar in outline to the head of a calf.
- Canary Diamond
Term used to describe an intensely or vividly bright-yellow fancy colour diamond.
- Cape Series Diamonds
The standard unit of measuring the weight of a diamond. The origin of the word traces back to ancient times when diamonds were weighed on balances against carob beans, which held a consistent weight. One carob bean, or carat, weighs 1/5 of a gram.
Diamonds are made of pure carbon that has been subjected to and crystallised under enormous heat and pressure. Without the pressure, graphite is formed instead of diamond. Other forms of carbon can be found in substances like coal, but these are impure forms of carbon.
- Carbon Spots
A complete, accurate report describing the specific characteristics of a diamond, issued by a recognised and independent diamond grading laboratory. A diamond certificate lists all the characteristics of a diamond that allows you to determine its current appraisal and fair market value. Also called a Diamond Grading Report. A diamond certificate is not an appraisal and does not contain a monetary value. Click here for a guide to the information that a diamond certificate must have.
- Chameleon-Type Diamond
A very rare type of diamond that changes colour when exposed to different light and heat conditions.
- Champagne Diamond
The World Jewellery Confederation, an international confederation of national jewellery trade organizations. CIBJO’s purpose is to encourage harmonisation, promote international cooperation in the jewellery industry, and to consider issues that concern the trade worldwide. Foremost among these is to protect consumer confidence in the industry.
- Clarity Enhancement
- Closed Table
- Coated Diamond or Coating
Refers to a coloured diamond that is dark brown in colour.
- Cold Laser Inscription
The use of a very fine, precise laser beam to write a grading report number or customised personal message on the girdle of a diamond, generally for identification purposes. Cold laser inscription is 100% safe for diamonds, compared to hot laser inscription. The laser inscription is invisible to the naked eye and can only be seen with a magnifying loupe. Click here to learn more about diamond laser inscription.
- Coloured Diamond
Any diamond with a noticeable body colour other than white. Colour in diamonds is caused by either various impurities trapped in the diamond crystal as it was forming in the earth, or by irregularities in the crystal structure itself. Some coloured diamonds fall into the valuable fancy colour category of diamonds.
- Conflict Diamonds
Diamonds that originate from areas controlled by rebel forces that are opposed to the governments in power, and are used to finance wars against these governments. Along with the other resources like oil and timber The Kimberley Process has been put in place to combat trade these diamonds, also known as’blood diamonds‘. Click here to learn more about conflict diamonds and the Kimberley Process.
Upper part, or ‘top half’ of the diamond, above the girdle.
- Crown Angle
- Crown Height
- Crown Height Percentage
Type of inclusion where a mineral deposit, or sometimes another diamond, is trapped inside the diamond. Crystals often look like bubbles of various shapes and sizes.
- Cubic Zirconia
Colourless, transparent, man-made material that is often used to imitate diamond – a diamond simulant. The chemical name is zirconium dioxide (ZrO2).
- Cushion Cut
- Cut Grade
A diamond that is fashioned so as to minimise the amount of rough diamond crystal cut away. Carat weight may be gained, but brilliance, fire, and beauty are lost. The resulting proportions can make some diamonds look ‘bulgy,’ ‘lumpy’, ‘deep,’ or ‘undersize,’ while others may be flat or have symmetry deviations.