What does bortz mean?
Bortz is a noun referring to diamond material of inferior quality—stones that are too flawed, fractured, or irregularly shaped to be cut into gemstones. Rather than being worthless, bort has long been prized by industry: crushed and powdered, it serves as an abrasive, and it is set into the edges of drills, saws, and grinding wheels wherever extreme hardness is required. The word entered English from German Bortz, which itself traces back through Middle Dutch, and it remains a specialist term within the diamond trade, where dealers sort rough stones into gem quality and bort. In modern usage the shorter spelling 'bort' predominates, so readers are most likely to encounter 'bortz' in older trade literature or in German-influenced sources. The word is a reminder that even a gemstone's rejects can be valuable—the same crystalline carbon that makes a diamond beautiful also makes its flaws indispensable to heavy industry.
nounBortz is low-grade or imperfect diamond material, too flawed or irregular for use as gemstones but valued for industrial purposes such as cutting, drilling, and abrasives.
- Flawed, non-gem-quality diamond used industrially as an abrasive or in cutting tools
"The drill bits were tipped with crushed bortz because only industrial-grade diamond could withstand the heat and pressure."
"The mining company sold its bortz separately from the gem-quality stones at auction."
"A thin layer of bortz embedded in the saw blade cut through the granite with ease."
Rarely needed, as bort is typically treated as an uncountable mass noun denoting a grade of diamond material rather than countable individual stones.
"The shipment contained several grades of bortz, sorted by size and clarity."
Some of the world's toughest drill bits owe their bite to diamonds too ugly to ever sit in a ring.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bortz
Bortz comes from the German word Bortz, meaning poorly crystallized or flawed diamond. German likely borrowed it from Middle Dutch boort or a related Low German form. It entered English during the era when Britain's lapidary and mining vocabulary absorbed many terms from continental diamond-cutting centers, though the exact date of first attestation is uncertain. The variant spelling 'bort' became the more common English form over time.
How bortz is actually used
Bortz is a technical term used mainly in the diamond trade and industrial contexts; it is rare in everyday speech. The spelling 'bort' is more common in modern English usage.
Easily confused with bortz
'Bort' is the standard English spelling of the same word, while 'bortz' is a variant spelling closer to the original German.