A natural is a part of the rough diamond's original surface left on the cut stone. It is usually on or near the girdle.
In more detail
It is a blemish. It shows that the cutter kept as much weight as possible. It is also a clue to diamond. GIA lists it among the features that a diamond can show and moissanite doesn't.
On a grading report
Drawn in green on GIA's clarity plot and listed after the inclusions in the key to symbols.
Related terms
- Indented natural: An indented natural is a part of the rough diamond's original surface that dips below the polished surface.
- Girdle: The girdle is the narrow band at the widest part of a cut stone, between the crown and the pavilion. It is the edge that a setting grips.
- Blemish: A blemish is a clarity characteristic confined to the surface of a diamond.
- Key to symbols: The key to symbols is the list beside the clarity plot. It names the kinds of clarity characteristic on that plot.