ideal color for a pearl is white. Although all fine white pearls show
by comparison a tint of some color, a fine white must be free from an
appearance which can only be described as "dark." It is not color
always but a certain density which makes the gem appear dead by
comparison with the soft, warm, life-like white of the perfect pearl.
The layers or skins of some pearls are more transparent than others and
this imparts a liveliness which is absent in the more dense.
looking at a string of pearls held between the eye and the light, some
will appear much lighter than others and show a translucent band about
one-fifth the diameter of the pearl, extending from-the edge of the
circumference inward. Such pearls upon examination will be found much
finer in color and texture than those which have the appearance beside
them of dark opaque spots when held against the light.