The familiar story says that a pearl begins when a grain of sand enters an oyster.
The real process is a little more interesting.
How Does a Pearl Form?
According to the Gemological Institute of America, a natural pearl forms when a microscopic irritant enters the body of certain mollusks.
That irritant is not always sand. It may be a tiny parasite, a fragment of shell, or another foreign material.
The mollusk responds by surrounding the irritant with protective material. In many pearl-producing mollusks, layers of nacre gradually build around it. Nacre is also the material that creates the beautiful interior surface commonly called mother-of-pearl.
Over time, those layers can form a pearl.
Natural and Cultured Pearls
Natural pearls form without deliberate human assistance and are exceptionally rare.
Cultured pearls are also grown inside living mollusks, but the process begins when a trained technician carefully inserts a bead, tissue, or both. The mollusk then performs the remarkable work of coating the material and developing the pearl.
“Cultured” does not mean imitation. Cultured pearls are genuine pearls created through a partnership between people and nature.
What Determines Pearl Quality?
GIA evaluates pearls using seven important value factors:
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Size
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Shape
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Color
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Luster
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Surface quality
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Nacre quality
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Matching
This explains why two pearls of similar size may look—and be valued—very differently.
Pearls can also appear in far more than traditional white. Depending on their type and origin, they may display cream, gold, gray, black, green, pink, or brown tones.
Discover Pearls at Diamond Jim's Pineforest Jewelry Experience
Browse our current pearl jewelry collection, including classic and contemporary designs.
You can also bring your existing pearl jewelry to Pineforest Jewelry for professional inspection or restringing.
Research credit: Gemological Institute of America: Pearl Gemstone Information and GIA’s Guide to Pearl Types.