A crystal is a mineral crystal contained in a diamond.
In more detail
A dark crystal under the table can set the grade on its own. GIA found none of the mineral crystals typical of diamond in its 1997 moissanite samples.
On a grading report
Drawn in red on the clarity plot of a full GIA report and named in the key to symbols. A Dossier has no plot but can name it in its list of up to four.
Related terms
- Pinpoint: A pinpoint is a very small crystal inside a diamond that looks like a tiny dot at 10x.
- Knot: A knot is a white or transparent diamond crystal that reaches the surface after the stone is cut.
- Needle: A needle is a thin, elongated crystal inclusion that looks like a tiny rod at 10x.
- Inclusion: An inclusion is a clarity characteristic inside a diamond, or one that reaches the surface from inside.