POLISH OF DIAMONDS
BLEMISHES.
a) Extra facet: Any polished facet, which is added to the normal number of facets, of a particular cut.
b) Natural: Unpolished surface, characteristics for a rough diamond.
c) Nick: Small blemish, which manifests itself in the removal of material.
d) Scratches: Fine, white linear depressions.
e) Polish lines: Very fine grooves, engraved by the polishing wheel, restricted at the edges of the facet.
f) Burning marks: These are the result of excessive heating of one or more facets, during the polishing process or setting. They look like white or bluish, oily clouds.
g) Abrasion: Abraded facet edges (or abraded culet), either by daily use or by putting too many stones in one paper. The edges appear indefinite, white, and granular.
SYMMETRY defects of a posted Diamond
a) Off-center table.
b) Offf- center culet.
c) Irregular girdle.
d) Facets out of alignment.
e) Open facets.
f) Irregular facet (in shape and size)
g) Stone not round (round brilliant only)
FINISH DEGREES.
VERY GOOD: MEDIUM No faults with 10 X
GOOD: Minor faults, hardly visible with 10 X
MEDIUM: Major faults, easily visible with 10X
FAIR: Faults are obvious with 10 X
