nautilus
pearl nautilus shell pendant on peacock pearls
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| composition | calcium carbonate, similar to abalone, coral, paua and pearl |
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| color source | caused by light being refracted within the crystal layers of the shell, as well as diet and genetic factors |
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| significant sources | rivers, streams, lakes, and oceans and many other places |
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| MOH scale | 2.5 |
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| care and treatment | Shell, composed of calcium carbonate, is fragile. Wash gently with warm water and a mild soap. Do not clean in an ultrasonic jewelry cleaner as the cleaning agents are far too harsh for organic materials. |
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