Mother of Pearl

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Physical & Optical Properties

Category Organic Gems
Mohs Hardness 2.5 – 4.5
Specific Gravity 2.65 – 2.87
Refractive Index 1.53 – 1.69
Luster Pearly
Color various
Birefringence 0.16

Mohs Hardness

Mohs Hardness: 2.5 – 4.5
1 Soft10 Hard

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Mother of Pearl

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About Mother of Pearl

Mother of pearl (nacre) is the iridescent inner lining of mollusk shells, composed of alternating layers of aragonite platelets and conchiolin protein that produce spectacular iridescent colors through thin-film light interference. It has been harvested from marine and freshwater bivalves and abalone since prehistoric times and has been used extensively in jewelry inlay, buttons, decorative objects, and as a writing support in marquetry. Major commercial sources include the Persian Gulf, Australia, French Polynesia, and the Philippines, where pearl oysters are cultured for both nacre and pearls.

Jewelry Use

Durability 1/10

Science FYI Family

Frequently Asked Questions

What is Mother of Pearl?
Mother of pearl (nacre) is the iridescent inner lining of mollusk shells, composed of alternating layers of aragonite platelets and conchiolin protein that produce spectacular iridescent colors through thin-film light interference. It has been harvested from marine and freshwater bivalves and abalon
What is the hardness of Mother of Pearl?
Mother of Pearl has a Mohs hardness of 2.5 to 4.5, making it relatively soft for use in jewelry.
What color is Mother of Pearl?
Mother of Pearl is primarily Various.
How much does Mother of Pearl cost?
Mother of Pearl falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
How do you care for Mother of Pearl?
Mother of Pearl is relatively soft and should be handled with care. Store separately from harder gemstones to prevent scratching.

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