The pearls have seven value factors:

–Spherical pearls can range from 2 mm to more than 20 mm in diameter.

–Shape. From round, near round, oval, button, drop, semi-baroque and baroque.

–Color. Pearls colors range from white to black in tone.

–Luster: It is the most important of all the value factors to the beauty of the pearl.

–Nacre Quality. It is a pearl’s nacre thickness.

–Matching. It is the uniformity between them.