Which of the following is NOT a standard category of defects in diamonds?

• A. Fracture
• B. Point
• C. Line
• D. Volume

Answer: (A)

Defects in diamonds are described by their dimensionality: point defects are 0-dimensional, line defects are 1-dimensional, and volume defects are 3-dimensional. This framework helps graders communicate how a flaw sits and grows within or on the crystal. Fracture, while a real flaw, isn’t one of these broad dimensional categories; it’s a specific type of surface-breaking crack described separately, so it doesn’t belong to the standard set of point, line, or volume defect categories. The other terms fit neatly into the three-dimensional grouping: a tiny pinpoint is a point defect, an elongated feature is a line defect, and a sizable irregularity occupying space is a volume defect.