---
title: "Crystal: meaning in gemology"
description: "A crystal is a mineral crystal contained in a diamond."
url: https://digitalgemology.com/learn/glossary/crystal-inclusion
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Clarity characteristics

# Crystal

Also called included crystal, mineral crystal

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](https://digitalgemology.com/learn/glossary/pinpoint): A pinpoint is a very small crystal inside a diamond that looks like a tiny dot at 10x.
- [Knot](https://digitalgemology.com/learn/glossary/knot): A knot is a white or transparent diamond crystal that reaches the surface after the stone is cut.
- [Needle](https://digitalgemology.com/learn/glossary/needle): A needle is a thin, elongated crystal inclusion that looks like a tiny rod at 10x.
- [Inclusion](https://digitalgemology.com/learn/glossary/inclusion): An inclusion is a clarity characteristic inside a diamond, or one that reaches the surface from inside.

## Learn more

- [The diamond clarity scale explained, from FL to I3](https://digitalgemology.com/learn/four-cs/diamond-clarity-scale)
- [The loupe test: doubled facet edges in moissanite](https://digitalgemology.com/learn/diamond-vs-moissanite/moissanite-doubled-facets-loupe-test)

[All 328 terms](https://digitalgemology.com/learn/glossary)