A knot is a white or transparent diamond crystal that reaches the surface after the stone is cut.
In more detail
A knot is a diamond crystal inside the diamond that reaches a polished facet. GIA lists it among the inclusions.
On a grading report
Drawn in red and green together on the clarity plot of a full GIA report. A Dossier has no plot but can name it in its list of up to four.
Related terms
- Crystal: A crystal is a mineral crystal contained in a diamond.
- Cavity: A cavity is an angular opening in the surface of a diamond. It forms when part of a feather breaks away, or when a surface-reaching crystal comes out during polishing.
- Inclusion: An inclusion is a clarity characteristic inside a diamond, or one that reaches the surface from inside.