diamantar

A rare verb meaning to give something the brilliance or shine of a diamond, or, in industrial use, to fit a tool with diamond abrasive tips: una broca diamantada. The literal poetic sense is largely obsolete; the industrial adjective diamantado is the far more common surviving form.

• El poema describe cómo la escarcha diamantaba los campos al amanecer. — The poem describes how the frost gave the fields a diamond-like sparkle at dawn.
• La fábrica usa discos diamantados para cortar el granito. — The factory uses diamond-tipped discs to cut granite.
• Pocos hablantes usan hoy el verbo diamantar fuera de un contexto técnico o literario. — Few speakers use the verb diamantar today outside a technical or literary context.

Expecting diamantar to be common vocabulary — most native speakers only ever encounter its adjective form diamantado (as in "herramienta diamantada"), not the verb itself.