An included diamond crystal that extends to the surface after fashioning is called?

An included diamond crystal that extends to the surface after fashioning is called?

• A. Kaps
• B. Lamproite
• C. Irradiation
• D. Knot (K)

Answer: (D)

A knot is an included diamond crystal that extends to the surface. This happens when an internal crystal grows long enough to reach the exterior of the gem, so you can see part of the crystal peeking out at the surface after cutting and polishing. Knot inclusions can affect how light interacts with the diamond and may influence polish quality or durability, sometimes impacting the clarity grade. The other terms don’t describe this situation: a rock type like lamproite is a source rock, not an inclusion; irradiation refers to a color-change treatment, not an internal feature; and “kaps” isn’t a standard term used for this kind of inclusion. So the correct term for an included crystal that reaches the surface is knot.

A knot is an included diamond crystal that extends to the surface. This happens when an internal crystal grows long enough to reach the exterior of the gem, so you can see part of the crystal peeking out at the surface after cutting and polishing. Knot inclusions can affect how light interacts with the diamond and may influence polish quality or durability, sometimes impacting the clarity grade.

The other terms don’t describe this situation: a rock type like lamproite is a source rock, not an inclusion; irradiation refers to a color-change treatment, not an internal feature; and “kaps” isn’t a standard term used for this kind of inclusion. So the correct term for an included crystal that reaches the surface is knot.