Rough Diamonds

Read all about rough diamonds

Campbell Coyle Gems is a licensed buyer and seller of rough and polished diamonds and as a KPC member we are committed to the trading of legal diamonds, adhering to a zero-tolerance policy against conflict diamonds whilst operating with 100% transparency. Whether a client is in the market for rough or polished diamonds, we are guaranteed to assist with top quality diamonds.

Below you will find the basic forms of diamonds namely cubic or also known as hexahedron, dodecahedron, irregular diamond crystals, macles as well as octahedrons all of which are formed depending on environmental conditions. Speak to one of our advisors to find out which type of rough diamond is a great investment opportunity or if you would like to sell rough diamonds.


Most cubic also known as hexahedron crystals are industrial quality diamonds. Most of these diamonds have six square faces. Hexahedron diamond crystals are comonly called boart. Some cubes of fancy yellow colour are sometimes found in cubic crystals.


This is also a very common shape of rough diamond. It has 12 faces that give the rough diamond of this shape a less angular appearance than the octahedron. These octahedrons and dodecahedrons shapes are most commonly encountered in rough gem diamonds and represent approximately 50% of rough diamonds in a typical parcel.


A term used in the diamond trade for a flat, triangular, rough diamond, which is a twinned crystal of the spinel-twin type (in which the twin plane is parallel to an octahedral face, with one side appearing to have been rotated 180 degrees with respect to the other). It is more difficult to fashion than most other crystals because of the differing grain directions caused by the twinning. Due to their odd shape, macles are often used for fancy cuts.

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