- Luster – The most important of all value attributes in a pearl is luster. Luster is defined as the quality and quantity of light reflecting from the surface or from under the surface of a pearl.
- Size – When the other value factors are equal within a pearl type, the larger the pearl size measured in millimeters, the higher the value.
- Shape – Pearls come in a wide variety of shapes but in most circumstances, the more round the pearl, the higher the value.
- Color – Depth and consistency of color in the body of the pearl help determine the value.
- Surface Quality – The cleaner the surface of a pearl (fewer bumps, marks and dull spots) the more valuable the pearl.
- Matching ability – The equality or unity of pearl size adds to the value of the pearl.
- Nacre thickness – This is only relative to bead-nucleated pearls as non-beaded (traditional freshwater pearls and keshi pearls) are 100% nacre. The thicker the nacre and regularity of its layers in a saltwater pearl, the more valuable a pearl. If the pearl displays a chalky or dull appearance, the nacre is too thin.
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