What does bruting mean?
Bruting is a specialized term from the world of diamond cutting. It refers to the stage in which a rough diamond is shaped into a rounded form by grinding it against a second, rotating diamond — a process possible because diamonds are hard enough to abrade only each other. The bruted stone emerges with a rounded girdle, ready for the facets to be blocked and polished. Beyond the workshop, bruting can carry a figurative sense drawn from the verb "to brute": treating a person or creature as an irrational beast, without feeling or dignity. This figurative use, however, is uncommon in modern English, and readers will most often encounter the word in jewelry, lapidary, or gemology contexts, where it denotes a precise and essential craft operation rather than anything harsh or cruel.
The process of rounding a rough diamond by grinding it against another rotating diamond, typically to form the girdle.
"After sawing, the stone moved on to bruting, where it was slowly worn into a round shape."
Primarily used within the diamond-cutting and gemology trades.
Present participle of the verb "brute": to shape a diamond by grinding it against another; or, figuratively, to treat someone as a brute.
"The craftsman was bruting the girdle when we toured the workshop."
The verbal sense is rare outside technical contexts.
Rarely pluralized; the term normally appears as an uncountable mass noun referring to the process itself.
"Different brutings of the same stone can yield noticeably different outlines."
In diamond cutting, only a diamond can shape another diamond — and that raw, grinding process has its own name: bruting.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bruting
The word derives from "brute," which English took from Old French "brut," ultimately from Latin "brutus," meaning heavy, dull, or irrational — the same root that gives us "brutal" and "brutality." In the diamond trade, bruting came to name the grinding of one stone against another, so called because the work is crude and forceful compared with fine polishing. The figurative sense follows directly from the Latin idea of the brute as a being without reason.
Related word forms
How bruting is actually used
"Bruting" is chiefly a technical term of the diamond trade, where it names a specific early stage in faceting; the general sense of treating people brutishly exists but is rare and usually better expressed with "brutalization" or related words.
Easily confused with bruting
Routing means cutting channels in material or directing traffic along paths, while bruting is the grinding of one diamond against another to shape it.