Which term describes angular openings starting at the surface and extending into the diamond, often with striations perpendicular to their length, and considered inclusions?

Which term describes angular openings starting at the surface and extending into the diamond, often with striations perpendicular to their length, and considered inclusions?

• A. Feather
• B. Etch Channels
• C. Eye-visible
• D. Extra Facet (EF)

Answer: (B)

Etch channels are angular openings that start at the surface and extend into the diamond, often showing striations perpendicular to their length, and they are considered inclusions. This specific morphology—surface-originating angular channels with perpendicular striations—is a classic description of etch channels, making them internal features that affect clarity. Feathers are more like wispy cracks that resemble a feather, not neatly etched channels with perpendicular striations. Eye-visible relates to whether an inclusion can be seen without magnification, not a distinct type. Extra Facet is about an additional facet, not an inclusion.

Etch channels are angular openings that start at the surface and extend into the diamond, often showing striations perpendicular to their length, and they are considered inclusions. This specific morphology—surface-originating angular channels with perpendicular striations—is a classic description of etch channels, making them internal features that affect clarity. Feathers are more like wispy cracks that resemble a feather, not neatly etched channels with perpendicular striations. Eye-visible relates to whether an inclusion can be seen without magnification, not a distinct type. Extra Facet is about an additional facet, not an inclusion.