Diamond Bourse

Organisation of diamond industry members. The main purpose of a diamond bourse is to provide an environment for the trading of diamonds within a set of ethical business practices. All diamond bourses have a legal, ethical framework to enact regulations for members and protect consumer confidence. Also referred to as a ‘Diamond Club’.

Depth

Distance in millimeters or percentage from the table plane to the culet. Also known as ‘total depth’ or ‘total height’.

Culet

Tiny point on the bottom of a brilliant cut diamond, or the bottom edge of a step cut diamond.  A culet can be prone to damage, thus diamonds are usually set in jewellery in such a way that the culet is protected.

Crystal

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.