Industrial-grade diamond or diamond dust, typically used for cutting, grinding, or polishing tools because of its extreme hardness.
From Afrikaans 'bort,' derived from African languages. The term entered English through the diamond trade, referring to imperfect or low-quality diamonds unsuitable for jewelry but perfect for industrial use.
Boart diamonds aren't pretty enough for engagement rings, but they're incredibly useful—dental drills, saw blades, and precision cutting tools all use boart because it's the hardest natural material on Earth!
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