Judi McCormick / biogenic

The definitive book on Pearls, by Elisabeth Strack

The definitive book on Pearls, by Elisabeth Strack

At over 700 pages long, I go to Strack's book whenever I have a question about pearls.

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Pearl Nacre Thickness

Pearl Nacre Thickness

The thicker the nacre of a pearl and the better the quality, the more exquisite the pearl.
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What are Biogenic Materials?

What are Biogenic Materials?

Historically, gem materials of a biological origin were called organic. The term organic can be confusing as a definition by itself because of its use as a clarifying word for natural substance that has had no additional chemical intervention. 
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