---
title: "Clarity enhancement: meaning in gemology"
description: "Clarity enhancement is filling surface-reaching fissures with a filler such as oil, resin, wax or glass, so they show less."
url: https://digitalgemology.com/learn/glossary/clarity-enhancement
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Treatments and origin

# Clarity enhancement

Also called fissure filling, filling

Clarity enhancement is filling surface-reaching fissures with a filler such as oil, resin, wax or glass, so they show less.

## In more detail

It is most common in emerald. Organic fillers can dry out or deteriorate, and a jeweler can remove or refill them. So labs state the condition only at the time of examination.

## On a grading report

Fissure filling, or indications of clarity enhancement/modification, with the amount: minor (F1), moderate (F2) or significant (F3).

## Related terms

- [Emerald oiling](https://digitalgemology.com/learn/glossary/emerald-oiling): Emerald oiling is filling an emerald's fissures with a colorless oil to make them less visible.
- [Resin filling](https://digitalgemology.com/learn/glossary/resin-filling): Resin filling is filling a gem's fissures or cavities with a resin, often one that hardens, to hide them.
- [Lead-glass filling](https://digitalgemology.com/learn/glossary/lead-glass-filling): Lead-glass filling is a treatment that fills fissures and cavities in corundum, mostly ruby, with high-lead glass to hide them.
- [Enhancement degree](https://digitalgemology.com/learn/glossary/enhancement-degree): The enhancement degree is the amount of filler a lab finds in a gem's fissures: minor, moderate or significant.
- [Fissure](https://digitalgemology.com/learn/glossary/fissure): A fissure is a crack in a gem, often open to the surface. Labs use the word for the cracks that fillers can enter.

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