There are SIX factors that determine the value
of pearls:
Pearl luster : It describes the shininess in a pearl and is a
combination of surface brilliance and inner glow. A very good luster means
it has higher pearl value.
Pearl Nacre : The iridescent internal layer of a mollusk
shell. It is a natural substance oyster secretes to protect its sensitive
flesh. The thin nacre is very prone to peeling and chipping whereas
thicker layer commands more value because of its greater luster depth.
Pearl Surface : If outer surface is very clean and have very
few blemishes such pearls carry higher value. Higher quality of pearls
have mirror like finish and without any blemishes on its surface.
Pearl Size : Pearls are commonly measured in millimeters
(mm) in their diameter. Large size pearls carry higher prices. Even 1 mm
makes the difference. The average most sold pearls today are between 6.5mm
and 7.5mm and are preferred choice of many young women. Depending upon
age, taste, status and styles many go for higher sizes as well.
Pearl Color: Surface color or body color. Most irradiated or
dyed pearls have surface colors. The natural pearl colors are white,
black, champagne, green, gray, aqua and gold. Again within each category
there are common overtones. White with rose overtones look great
especially on fair skin and the cream or the golden overtones look
fabulous on darker complexions. Most important is woman's taste and
preference.
Pearl Shape : The perfect round shape always have high pearl
values but near round or off round are very much common, great in demand
and sold everyday. Pearl necklaces are not restricted to round shape
pearls only and other shapes like tear drop, pear, potato, coin and
irregular baroque shape pearls are equally popular among women and
commonly used by jewelers and designers alike.