Black Pearls are defined according to the following categories:

SHAPES
ROUNDS Almost perfectly spherical in shape
SEMI-ROUND Not perfectly round but roundish in shape
CIRCLE Almost completely spherical with accentuated lines and ridges
DROP Oval cylindrical or more commonly teardrop
BAROQUE Odd shaped

COLOURS
PINK-ROSE Pinkish or reddish hues
WHITE-GREY White ranging through to the lightest grey shades
GREY. True grey
GREY-PLATINUM Darker greys through to light platinum
PLATINUM Darker black pearls
BLUES Hints of blue tinges
PEACOCKS Hints of many colours, sometimes rainbow shades
GOLDS Goldish or golden hues
GREEN-BLACK Greenish ranging through to darker shades

LUSTRE
MATT Sheen less accentuated
FINE Sheen more pronounced
EXCEPTIONAL Sheen almost mirror like, very high gloss

SURFACE
MARKED Noticeable pitts and imperfections
FINE One or two slight imperfections
EXCEPTIONAL Almost perfect in every way