The mined stones are classified into different varieties
1. Diamonds, well crystallized, transparent and gem quality
2. Bort, boart or bortz, poorly crystallized, grey to brown in color, translucent to opaque and used mostly in industry as an abrasive. The large and black stones of granular crystalline structure found almost exclusively in the state of Bahia in Brazil are also known as carbonado or carbonate.
3. Ballas – spherical masses of minute diamond crystals more or less concentrically arranged. The mass in very hard and rough and has important industrial applications.
Rough diamond crystals are mostly of diameter lass than a millimeter in diameter. Bog crystals are extremely rare and so valuable that they acquire the status of an antique and are known by special and distinctive names. History and legend play a bigger part than the actual inherent value of these stones. They are mostly found as part of the crown jewels of various nations.
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