---
title: "Laser drill hole: meaning in gemology"
description: "A laser drill hole is a tiny, surface-reaching tunnel made by a laser beam, usually toward a dark inclusion."
url: https://digitalgemology.com/learn/glossary/laser-drill-hole
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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

# Laser drill hole

Also called LDH, laser drill-hole

A laser drill hole is a tiny, surface-reaching tunnel made by a laser beam, usually toward a dark inclusion.

## In more detail

It is the trace of a laser drilling treatment. GIA grades a laser-drilled stone and discloses the treatment.

## On a grading report

Listed first in GIA's key to symbols and drawn in red and green together; Comments describes the treatment.

## Related terms

- [Laser drilling](https://digitalgemology.com/learn/glossary/laser-drilling): Laser drilling is a clarity treatment that bores a tiny channel to an inclusion, usually a dark one. The laser then burns the inclusion away, or a bleaching agent enters through the channel.
- [Internal laser drilling](https://digitalgemology.com/learn/glossary/internal-laser-drilling): Internal laser drilling is laser work inside a diamond that creates or widens a surface-reaching feather around a dark inclusion. The feather lets a bleach in to make the inclusion less visible.
- [Key to symbols](https://digitalgemology.com/learn/glossary/key-to-symbols): The key to symbols is the list beside the clarity plot. It names the kinds of clarity characteristic on that plot.
- [Comments](https://digitalgemology.com/learn/glossary/comments): Comments is the report section for identifying characteristics or features that have no other line on the report. It is also where the lab describes a treatment that it detected.

## Learn more

- [The clarity plot: how to read the inclusion map on a report](https://digitalgemology.com/learn/grading-reports/diamond-clarity-plot)
- [Comments, treatments and lab-grown origin on a diamond report](https://digitalgemology.com/learn/grading-reports/diamond-report-comments-treatments-origin)

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