What is mother of pearl?
By Jared James · Last updated 21 May 2026
Definition
Mother of pearl is the iridescent inner lining of mollusk shells, also called nacre, and it is the same material that makes up a pearl. A mollusk secretes nacre as a protective coating inside its shell, building it up in thin crystalline layers that reflect light and produce the characteristic soft shimmer of whites, creams, pinks and greens that shift with the angle. In jewellery it is cut into thin slices and used for watch dials, shell cameos, pendants, rings and inlay work, and it has been prized for its luminous quality for thousands of years.
Frequently asked questions
- What is the difference between mother of pearl and pearl?
- They are made of the same material, nacre, but mother of pearl is the flat layer secreted on the inside of the shell, while a pearl forms as a concentric sphere of nacre built up around an irritant inside the mollusc. Mother of pearl is harvested from the shell itself; pearls are separate objects formed within it.
- How do I care for mother of pearl jewellery?
- Keep it away from acids, perfume, hairspray and harsh cleaning products, which can etch and dull the surface. Wipe it gently with a soft damp cloth and store it separately from harder gemstones that could scratch it.
- Is mother of pearl expensive?
- Mother of pearl is generally more affordable than pearl itself, because it comes from the shell rather than a discrete gemstone. Quality varies with the thickness, lustre and source, and large, unblemished pieces of fine lustre command higher prices.
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