Trade term for a diamond that has a relatively small table in relation to the size of the diamond. A small table reduces the amount of brilliance, but may increase the amount of fire.
Cloud
Cluster of pinpoint inclusions creating a hazy or milky area in a diamond. A diamond cloud can range from extremely sparse and faint, to dense and heavy. Clouds may also be small and localised, or spread throughout an entire diamond and affect the transparency.
CIBJO
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
Term used to describe the relative presence or absence of inclusions in a diamond. Most diamonds, when formed, contain imperfections of one kind or another. Clarity, sometimes called purity, is one of the four c’s of diamond grading that determines the overall diamond quality and value.
Clarity Enhancement
Any artificial treatment or process meant to improve the appearance of a diamond’s clarity. Laser drilling and fracture filling are examples of diamond clarity enhancement. Click here to learn more about diamond clarity enhancements.
Chameleon-Type Diamond
A very rare type of diamond that changes colour when exposed to different light and heat conditions.
Champagne Diamond
Refers to a coloured diamond that is light-brown or light brownish-yellow in colour.
Chip
Cavity
Type of diamond inclusion that appears as an opening or large indentation on the surface of a diamond. A tiny version of a cavity is a called a pit. Cavities affect both the clarity grade and the polish grade of a diamond.
Certificate
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.