What is an abrasion on a gemstone?
By Jared James · Last updated 21 May 2026
Definition
In the context of gemstones and diamonds, an abrasion is a scratch, bruise or series of tiny nicks worn into the surface of the stone, usually along facet edges or around the girdle. These marks build up over time through contact with harder materials, other jewellery, or everyday knocks, and they give the stone a dull, slightly frosted look where the facets meet. Abrasions are a common clarity characteristic on grading reports and can usually be polished out by a lapidary.
Frequently asked questions
- What causes abrasions on gemstones?
- Daily wear is the main cause; contact with harder surfaces, other stones, or even grit scratches the facet edges over time. Storing multiple pieces together without protection is a common culprit, as harder stones can scratch softer ones.
- Can abraded gemstones be repaired?
- Yes, a lapidary or jeweller can re-polish the stone to remove surface abrasions, restoring its original brilliance. It is a relatively minor job for surface scratches, though it may reduce the stone's weight very slightly.
- How do abrasions affect a diamond's clarity grade?
- Light abrasions on facet edges are noted as surface blemishes and can lower the clarity grade, particularly if they are visible without magnification. Severe abrasions that create a cloudy look around the stone will have a more noticeable impact on grade and value.
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