all about pearls logo All about pearls

Everything you always wanted to know about Pearls is available right here!

Share |

All About Pearls
All About Pearls Tutorial
Natural & Cultivated Pearls
How Pearls are Grown
interesting Pearl Information
Pearl History
Pearls In Religion
Types of Pearls
Black Pearls
Mikimoto Pearls
Buying Pearls
Simulation Pearls
Famous Pearls
Pearl Technical Details


Technical Details about Pearls

Here are some physical characteristics of pearls:

The hardness: 2.5 - 4.5
S.G.: 2.70 (fresh-water up to 2.74)
Size: from microscopic to many centimeter diameter (rare)
Luster - typical pearly luster is termed "orient"
A variety of colors, depending upon the type of mollusk and the water composition (polluted water produces unusual colors!)
bodycolor: underlying color: white-yellow (cream), black
overtone: "float" (resembles a filmy lacquer): pink / green / blue
o ~ 86 % calcium carbonate (CaCO3)
o 2 - 4 % water
o ~ 10 % conchiolin (an organic binding agent)
Together, the conchiolin and CaCO3 are referred to as nacre

Nacre consists of a series of alternating layers of conchiolin and crystals of CaCO3. The CaCO3 is in the crystal form known as aragonite. The typical iridescence of the pearl is due to the series of nacre layers. This is referred to as 'orient'(iridescent effect due to overlapping nacreous plates)

Pearl Links | Feedback | Disclaimer | Site Map | Terms

To Top of All About Pearls

Copyright © 2006 - 2017. ALL RIGHTS RESERVED. Technical Author Services Pty Ltd.

Webmaster: Technical Author Services Pty Ltd.