A pearl is layer upon layer of nacre that an oyster or mussel secretes around an irritant inside its own body, and almost every pearl sold today is cultured: a technician plants that irritant on purpose. Harvesting the pearl often kills the mollusc outright.
Made fromNacre secreted by a living mollusc
How it's seededA bead and tissue graft surgically implanted (cultured pearls)
At harvestOften killed by cutting the adductor muscle to open the shell
VerdictNot vegan
Where it hides
Pearl necklaces, earrings and rings, labelled "cultured" or "natural"
Buttons and inlay on jewellery boxes or musical instruments
Freshwater pearls from farmed mussels, a cheaper version of the same process
"Mother of pearl", the shell lining itself, on buttons and cutlery handles
What it is
US trade rules define a pearl in plainly biological terms:
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A calcareous concretion consisting essentially of alternating concentric layers of carbonate of lime and organic material formed within the body of certain mollusks
A natural pearl forms by accident, when an irritant lodges in the mollusc's mantle unaided. A cultured pearl, nearly everything sold today, forms the same way on purpose. The same rules define it as:
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a nucleus (usually a sphere of calcareous mollusk shell) planted by humans inside the shell or in the mantle of a mollusk is coated with nacre by the mollusk
In practice a technician surgically inserts a small bead cut from another mollusc's shell, plus a sliver of mantle tissue, into a live oyster or mussel and lets it sit coated in nacre for one to several years.
What harvesting involves
A training manual on the industry describes the standard method plainly:
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separating the two shell valves, by cutting the adductor muscle, making an incision on the gonad and squeezing the pearl out
which kills the oyster. Some operations extract more carefully instead, opening the shell without harming the animal so it can be returned to the water and implanted again, but oyster deaths during the culturing period itself still run into double digits even on well-managed farms. Either way, the pearl is grown inside, and taken from, a living animal's body. Under the same trade rules, an imitation pearl has to say so on the label rather than borrow the word "pearl" unqualified.
SilkSilk is the filament a silkworm spins to build its cocoon, and the standard way to harvest it kills the pupa inside before it can chew its way out and cut the thread. Peace silk lets the moth go free, but the insect is still farmed for its fibre.
LeatherLeather is an animal's tanned skin or hide, almost always cattle, and US labelling rules say a product can only be called leather if it is made in all substantial parts of it. Plant and lab-grown alternatives exist, but they need a different name on the tag to be legal.
WoolWool is fibre sheared from a sheep's fleece, or combed from a goat for mohair and cashmere, and that is the fibre's legal definition. Shearing alone does not kill the sheep, but the wool trade runs on the same farms that supply the meat trade.
Frequently asked
Are oysters alive when the pearl is removed?
Often not. The common manual harvesting method cuts the adductor muscle that holds the shell shut, which kills the oyster. Some farms use a gentler method to keep the oyster alive for a second round of seeding, but that is a minority practice, not the default.
Are freshwater pearls more ethical than saltwater ones?
Not fundamentally. Freshwater pearls come from farmed mussels seeded with tissue grafts rather than a bead nucleus, and several pearls can be grown per mussel, but the mussel is still a farmed animal used to grow a product for it.
What's a vegan alternative to pearls?
Glass, resin or shell-coated faux pearls, sold under names like "shell pearl" or "Majorica pearl", look convincing and, under US rules, have to be labelled as imitation rather than sold as a pearl outright.
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