Ballas or shot bort is a term used in the diamond industry to refer to shards of non-gem-grade/quality diamonds. It comprises small diamond crystals that are concentrically arranged in rough spherical stones with a fibrous texture. Ballas is hard, tough, and difficult to cleave. It is mostly found in Brazil and South Africa. ...
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http://en.wikipedia.org/wiki/Ballas
(from the article `industrial diamond`) Ballas, or shot bort, is composed of concentrically arranged, spherical masses of minute diamond crystals. Ballas is extremely hard, tough, and ...
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http://www.britannica.com/eb/a-z/b/12
A variety of industrial diamond in the form of very hard, dense, globular aggregates of minute concentric diamond crystals.
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https://www.encyclo.co.uk/local/20501
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