Which term refers to laser drilling within a diamond that doesn't reach the surface and is not plotted?

Which term refers to laser drilling within a diamond that doesn't reach the surface and is not plotted?

• A. Laser Drill-hole (LDH)
• B. Internal Laser Drilling (ILD)
• C. Kaps
• D. Knot (K)

Answer: (B)

Internal laser drilling describes a laser drill that stays entirely inside the diamond and does not reach the surface, so it isn’t shown on the standard inclusion plot. This term is used to differentiate from drill holes that break the surface, which labs plot as laser drill holes. The distinction matters because surface-reaching drills are easier to detect and disclosed, while internal drills may go unnoticed in a routine inspection but can still affect clarity. The other terms refer to different features: a drill hole that reaches the surface and is plotted, kaps are resin-filled cracks, and a knot is a natural inclusion; none of these describe drilling that remains entirely internal and unplotted.

Internal laser drilling describes a laser drill that stays entirely inside the diamond and does not reach the surface, so it isn’t shown on the standard inclusion plot. This term is used to differentiate from drill holes that break the surface, which labs plot as laser drill holes. The distinction matters because surface-reaching drills are easier to detect and disclosed, while internal drills may go unnoticed in a routine inspection but can still affect clarity. The other terms refer to different features: a drill hole that reaches the surface and is plotted, kaps are resin-filled cracks, and a knot is a natural inclusion; none of these describe drilling that remains entirely internal and unplotted.