Which term denotes the clarity characteristic totally enclosed in a polished gemstone or extending into it from the surface?

Which term denotes the clarity characteristic totally enclosed in a polished gemstone or extending into it from the surface?

• A. Habit
• B. HPHT
• C. Inclusion
• D. Indicator minerals

Answer: (C)

Inclusion is the term for a clarity feature that lies inside the diamond and can be totally enclosed or begin at the surface and extend inward. These internal features—such as crystals, feathers, or clouds—affect how light passes through the stone and thus its clarity grade. The other terms refer to something else: habit is the crystal shape, HPHT is a treatment/origin method, and indicator minerals are geological clues, not clarity features. So the description of a clarity characteristic completely inside the gemstone or reaching in from the surface fits inclusions.

Inclusion is the term for a clarity feature that lies inside the diamond and can be totally enclosed or begin at the surface and extend inward. These internal features—such as crystals, feathers, or clouds—affect how light passes through the stone and thus its clarity grade. The other terms refer to something else: habit is the crystal shape, HPHT is a treatment/origin method, and indicator minerals are geological clues, not clarity features. So the description of a clarity characteristic completely inside the gemstone or reaching in from the surface fits inclusions.