ballas
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thumb|Brazilian ballas Ballas (or shot bort) is a diamond industry term for roughly spherical shards of non-gem-grade diamond, mostly mined in Brazil and South Africa.
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thumb|Brazilian ballas Ballas (or shot bort) is a diamond industry term for roughly spherical shards of non-gem-grade diamond, mostly mined in Brazil and South Africa.
A ballas is an aggregate of diamond grains concentrically arranged with radiating structure into a roughly spherical stone with a fibrous texture and without throughgoing cleavage planes. Tougher and more difficult to cleave than crystalline stones, ballas are used as industrial diamonds.
Excerpted from Wikipedia’s “ballas” article, available under the CC BY-SA 4.0 licence.