Rough diamond means a person or thing of real worth, talent, or goodness despite an unpolished, awkward, rude, or undeveloped exterior. In poetry, the idiom is useful for character portraits that distinguish surface from potential. The diamond image suggests hidden brilliance requiring recognition, patience, or shaping. A poet may use it for a gifted child, blunt worker, outsider artist, or socially awkward friend. It can also raise questions about refinement: who decides what needs polishing, and what may be lost?

A rough diamond is a person with good qualities beneath coarse manners, lack of polish, or humble appearance. The idiom is rich for poetry because diamond suggests hidden value, pressure, cutting, and brilliance, while roughness preserves natural form. It suits character portraits, class observation, comedy, and moral recognition. Students should ask who has the authority to polish whom, and whether refinement improves or diminishes authenticity.