Polish is graded on a scale from Excellent to Poor based on the presence and visibility of polish features at 10x magnification. The following features are considered in the polish assessment.
|Abrasion||Abr||An area of minute scratches or pits along a facet edge producing a fuzzy white line instead of a sharp facet junction|
|Whitish haze caused by excessive heat during polishing or, occasionally, by a jeweler’s torch is listed as “Brn.”
A burn mark caused by excessive heat at the location where the dop touched the diamond is referred to more specifically as “Dop.”
|Laser Manufacturing Remnant||LMR||A remnant of laser manufacturing that remains on the surface of the polished diamond; typically appears as a transparent or white groove; only considered polish when it does not penetrate into the diamond at 10x magnification.|
|Lizard Skin||LS||A transparent, uneven texture confined to one facet caused by polishing a facet off-grain|
|Nick||Nck||A small notch on a facet junction, usually along the girdle or at the culet|
|Pit||Pit||A tiny opening appearing as a white dot|
|Rough Girdle||RG||An irregular pitted or granular surface of a bruted girdle due to pits and nicks|
|Scratch||Scr||A surface mark, normally seen as a fine white line that may be curved or straight|
|Parallel lines left by the polishing process; may appear white (Wht) or transparent (TP). A heavy transparent polish line off a surface-reaching feature is referred to more specifically as a "drag line".
A surface feature made during the polishing process that resembles an extra facet without a distinct or straight facet junction is referred to as a "polish mark".
This information is courtesy of GIA