Which statement about the term 'feather' is accurate?

• A. A color diffusion line
• B. A fracture
• C. The term for a surface impact hazard
• D. A trade term for any break in a diamond

Answer: (D)

Feather refers to a fracture-like feature inside a diamond, typically appearing as a wispy, plume‑like line that can extend toward the surface. In everyday diamond trading and grading language, this term is used to describe such breaks or cracks within the crystal. That makes the statement about feathers being a trade term for a break the best fit, because it captures how the term is applied in practice to communicate this specific type of flaw. The other options describe phenomena that aren’t what a feather denotes: color diffusion lines are a different kind of feature related to color spread, a surface impact hazard is a distinct surface defect, and while a feather is indeed a form of break, it is a specific pattern rather than a generic term for any break.