Pearls Trivia
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99 free Pearls trivia questions with answers — nature quiz, new questions added Oct 2026.
Pearl trivia for jewellery lovers, gem collectors, divers and anyone who has ever wondered whether a grain of sand really starts the whole thing (it almost never does). This quiz covers the science first: the mantle tissue that secretes nacre, the aragonite platelets that make it iridescent, why vinegar dissolves a pearl and how an X-ray tells a natural pearl from a cultured one. Then it moves to the history and the trade: the Persian Gulf and Sri Lankan fisheries praised by Pliny, the slave-worked beds of Cubagua and Margarita, Kokichi Mikimoto and the 1916 patent that made cultured pearls a mass product, and the modern names, Akoya, South Sea, Tahitian, freshwater, and what they mean. The famous individual pearls are here too: La Peregrina, once nearly swallowed by Elizabeth Taylor's puppy, the Pearl of Lao Tzu, the Pearl of Puerto and Vermeer's Girl with a Pearl Earring, plus Steinbeck's novella and Japan's ama divers. Questions range from easy to expert, and every answer was checked against a reference page and carries its source. If you enjoy this quiz, try our gemstones, oceans and jewellery quizzes next.
30 of 99 questions with answers and explanations. Play the quiz
Q 01Inside which part of a mollusc does a pearl form?
The mantle
The mantle is the soft tissue that also secretes the shell, and it coats any intruder in layer after layer of nacre.
Q 02Pearls are made mainly of which mineral?
Calcium carbonate
Calcium carbonate is the mineral of chalk and limestone, but a mollusc lays it down as hard crystal in concentric layers, the same way it builds its shell.
Q 03Pearl is a birthstone for which month?
June
June got pearl when American jewellers agreed an official birthstone list in 1912; moonstone shares the month, and alexandrite was added in 1952.
Q 04What gives nacre, also called mother-of-pearl, its rainbow shimmer?
Sheets as thin as light waves
Sheets as thin as light waves: nacre's stacked crystal plates are about as thick as a wavelength of visible light, so reflections interfere and the colours shift as you tilt it.
Q 05Pearls rarely start with a grain of sand; which intruder is a more typical trigger?
A parasite
A parasite is a classic trigger: the mollusc cannot expel the intruder, so it seals it off and coats it with layer upon layer of pearl.
Q 06Which common household liquid can dissolve a pearl?
Vinegar
Vinegar's acid reacts with the pearl's mineral and releases carbon dioxide, so the gem fizzes away; jewellers warn that any acid harms pearls.
Q 07Per Pliny the Elder, which queen dissolved a priceless pearl in a drink to win a dinner-party bet?
Cleopatra
Cleopatra bet Mark Antony she could spend ten million sesterces on one dinner; the umpire, Plancus, stopped her before she could dissolve her second pearl earring.
Q 08What word describes pearls that are irregular rather than round?
Baroque
Baroque described lumpy pearls in French before it named the ornate art style; the word is said to come from the Portuguese 'barroco', an irregular pearl.
Q 09Which examination technique is used to tell a natural pearl from a beaded cultured pearl?
X-ray
X-ray images reveal the solid bead at the heart of a cultured pearl, where a natural pearl shows growth rings from the centre outwards.
Q 10In the jeweller's 'tooth test', how does a real pearl feel when rubbed gently against a tooth?
Slightly gritty
Slightly gritty: a real pearl's surface is built from microscopic overlapping crystal plates, while glass or plastic fakes feel completely smooth.
Q 11Glass imitation pearls are traditionally coated with 'essence d'Orient', a solution made from what?
Fish scales
Fish scales yield tiny crystals with a pearly sheen; a 17th-century Paris rosary-maker named Jaquin is credited with first turning them into this 'pearl essence'.
Q 12One theory traces the word 'pearl' to the Latin 'perna', which meant what?
Leg
Leg, or more exactly a leg of ham: 'perna' also named a shellfish with a ham-shaped shell, though dictionaries call the link to 'pearl' only a likely guess.
Q 13Which girl's name comes from the ancient Greek word for pearl?
Margaret
Margaret comes through Latin from the Greek 'margarites', pearl, a word Greek probably borrowed from an Eastern language; devotion to Saint Margaret of Antioch spread the name in the Middle Ages.
Q 21Why are Tahitian pearls far scarcer than freshwater pearls?
Each oyster grows a single pearl
Each oyster grows a single pearl at a time, around one implanted bead, while one freshwater shell was once grafted to grow as many as 50.
Q 22Most freshwater cultured pearls sold in the 21st century come from which country?
China
China leads by a wide margin, while Japan, the first country to farm whole freshwater pearls, has seen its own industry all but disappear.
Q 23Keshi pearls share their name with the Japanese word for 'poppy'; what are they?
Small accidental pearls with no bead
Q 14Which Japanese entrepreneur is credited with creating the first cultured pearl, in 1893?
Kokichi Mikimoto
Kokichi Mikimoto grew his first half-round pearls in 1893 on an island off Toba, and in 1932 he publicly burned heaps of inferior pearls to show he sold only fine ones.
Q 15Which French composer wrote The Pearl Fishers (1863), set in ancient Ceylon?
Georges Bizet
Georges Bizet never saw it revived in his lifetime, yet its duet for two friends is now one of the most famous in the repertoire.
Q 16Which inventor met Japan's leading pearl farmer in 1927 and marvelled at his cultured pearls?
Thomas Edison
Thomas Edison called the cultured pearl something he had thought biologically impossible; his guest is said to have replied that he was only one small star among inventors.
Q 17Which jeweller is said to have bought its Fifth Avenue mansion in 1917 with a double strand of pearls?
Cartier
Cartier, by the firm's famous account, traded a necklace of natural pearls valued at $1 million for the house; cultured pearls later sent such prices tumbling.
Q 18Akoya pearls, the classic choice for a white strand, are farmed mainly in which two countries?
Japan and China
Japan and China are the main akoya producers; the oyster is so small that pearls over 10 mm across are extremely rare.
Q 19Which cultured pearls, grown in the world's largest pearl oyster, are typically the biggest?
South Sea pearls
South Sea pearls grow in Pinctada maxima, whose gold-lipped and silver-lipped varieties give them their golden or silvery-white colours.
Q 20Tahitian pearls are popularly known as what colour of pearl?
Black
Black is the trade name, but a truly black Tahitian pearl is extremely rare; most are charcoal grey, silver or dark green.
Small accidental pearls with no bead: keshi form when an oyster rejects its implanted bead yet keeps laying down pearl, so they are solid nacre all the way through.
Q 24Which island nation's 'Pearling Path' through old Muharraq is a UNESCO World Heritage Site?
Bahrain
Bahrain out-exported its neighbours in pearls until the trade collapsed in the 1930s, when Japan's cultured pearls arrived; oil then took over.
Q 25Pliny the Elder wrote that the most highly praised pearls came from which body of water?
The Persian Gulf
The Persian Gulf's pearls were 'specially praised', Pliny wrote, though he named Ceylon as the richest fishery of all.
Q 26Spanish conquistadors found a vast pearl bed around Cubagua and Margarita, islands off which country?
Venezuela
Venezuela's Cubagua boomed so fast that its pearl town, Nueva Cádiz, was made a city in 1528; within years the oyster beds were stripped and it was abandoned.
Q 27Pearls were said to be one of the attractions that drew which Roman leader to Britain?
Julius Caesar
Julius Caesar later dedicated a breastplate of British pearls in his temple of Venus in Rome, though Pliny judged the island's pearls small and poorly coloured.
Q 28Who bought La Peregrina, the pearl once owned by Spanish kings, at Sotheby's in 1969?
Richard Burton
Richard Burton paid $37,000 and gave it to Elizabeth Taylor for Valentine's Day; in 2011 it sold at auction for more than $11 million.
Q 29Where did Elizabeth Taylor find La Peregrina after it went missing in her Caesars Palace suite?
In a puppy's mouth
In a puppy's mouth: Taylor wrote that she noticed one of her dogs chewing on something, opened its jaws and took out the pearl, unscratched.
Q 30Which actress played the maid Griet in the 2003 film Girl with a Pearl Earring?
Scarlett Johansson
Scarlett Johansson moved from teen to adult roles with the part; the film adapts Tracy Chevalier's 1999 novel, which imagines how the painting came to be made.