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- A hard, spherical aggregate of many very small diamond crystals, usually cryptocrystalline, arranged radially and more or less concentrically around a central point. Because of their structure, ballas are classed as industrials that are occasionally used in diamond-drill bits and other diamond tools. See also: shot bort
- A dense, globular aggregate of minute diamond crystals, having a confused radial or granular structure lacking through-going cleavage planes, giving it a toughness that makes it useful as an "industrial diamond". CF: bort; carbonado.
- A term incorrectly applied to a rounded, single crystal of diamond.
- See: balas ruby
Source: Dictionary of Mining, Mineral, and Related Terms
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