Which statement about inclusions is true?

• A. They are always on the surface
• B. They are only internal
• C. They can be internal or extend from the surface
• D. They are always removable by polish

Answer: (C)

Inclusions are features inside a gemstone that may be entirely within the crystal or reach the surface. This is why inclusions can be internal or extend from the surface. Fully internal inclusions sit completely inside and don’t break the exterior, while those that extend to the surface break the boundary and can be visible from the outside as blemishes. Inclusions influence clarity grade because they affect how light travels through the stone, and they aren’t limited to the surface—many are embedded deep inside and can’t simply be removed by polishing.