Buy pearls by judging luster first, then surface, shape, color and size — in that order. Confirm the pearl is a genuine nacreous pearl (not glass or plastic), understand that nearly all fine pearls sold today are "cultured" rather than natural, and insist on clear disclosure of any treatment. A credible report from GIA, SSEF or Gübelin matters most for high-value or natural-color pieces. Get those right and size and price fall into place.

Cultured, natural or imitation — what you are actually buying

Almost every pearl sold today is a cultured pearl — a real pearl grown by an oyster or mussel with a small human-inserted nucleus. A natural pearl forms with no human help and is extremely rare and costly; an imitation (faux) pearl is glass or plastic, not grown by a mollusk. “Cultured” means genuine, not fake.

Cultured vs natural vs imitation pearls

Type	How it forms	Is it a real pearl?	Rarity / price
Cultured	Oyster/mussel grows nacre around an inserted nucleus	Yes — genuine pearl	The vast majority of fine pearls sold today
Natural	Forms with no human intervention	Yes — genuine pearl	Extremely rare, very expensive
Imitation (faux)	Glass or plastic bead coated to mimic a pearl	No — not grown by a mollusk	Inexpensive; not a real pearl

Quick checks: is a pearl real?

Test	Real (cultured or natural)	Imitation
Tooth / rub test	Slightly gritty against tooth edge or another pearl	Smooth and glassy
Surface	Tiny natural irregularities; no two identical	Flawlessly uniform
Temperature	Cool at first touch, then warms	Room temperature; warms instantly (plastic)
Weight	Has noticeable heft for its size	Often light (plastic) or unusually heavy (coated glass)
Certainty	These checks are a guide, not proof. A report from an accepted lab — GIA, SSEF, or Gübelin — is the only definitive confirmation.

Shop genuine cultured pearls: white South Sea, Tahitian, and Akoya pearls.

Three words get blurred, so start here:

• Cultured pearl — a real pearl of genuine nacre grown by a living oyster, where the process was started by inserting a nucleus. Essentially every fine South Sea, Tahitian and Akoya pearl sold today is cultured, and that is exactly what it should be called.
• Natural pearl — formed with no human help. These are extremely rare and command natural-pearl prices; the unqualified word "pearl" is reserved for them under US FTC rules and the CIBJO Pearl Book.
• Imitation pearl — glass, shell or plastic beads coated to look pearly. Not a pearl at all.

So a "cultured pearl" is real — culturing only describes how the pearl was started, not whether the nacre is genuine. Be cautious with any seller who advertises a "natural pearl" at a cultured-pearl price; that is either loose wording or a red flag. Our pillar pages explain each species in depth: the South Sea pearls guide, Tahitian pearls guide and Akoya pearls guide.

What to look for, in order

1. Luster. Tilt the pearl under a light. You want bright, sharp reflections with a deep inner glow, not a flat or chalky shine. GIA grades luster Excellent to Poor, and it is the single biggest driver of beauty. A smaller pearl with Excellent luster beats a bigger dull one every time.
2. Surface. Look for clean nacre with few and faint natural marks. Some surface character is normal even at the top grade; a totally mark-free pearl is exceptional, not the baseline.
3. Shape. Round is rarest and most classic, but near-round, drop, baroque and circled pearls each have their own appeal — and baroques often carry the most striking orient at the friendliest prices.
4. Color. Choose the bodycolor and overtone you love, and confirm whether it is natural. See our guide to South Sea pearls for which colors belong to which oyster.
5. Size. Pick a diameter that flatters you rather than the largest available; price rises steeply with size. Our pearl size guide shows what each millimetre looks like worn.
6. Matching. For studs and strands, the pearls should mirror one another in luster, color and shape. Good matching is a large part of a finished piece's value.

How to tell if pearls are real

A few honest checks separate genuine nacreous pearls from imitations. None is a substitute for a gemologist, but together they are revealing:

• The tooth test. Gently rub the pearl along the edge of your tooth. Real nacre feels faintly gritty; imitations feel glassy-smooth.
• Surface and uniqueness. Real pearls show tiny natural irregularities and subtle variation from pearl to pearl. Imitations are usually flawless and identical — a giveaway.
• Weight and temperature. Real pearls are denser and feel cool against the skin before warming; many plastic imitations feel light and warm immediately.
• Overtone and depth. Genuine pearls have a multidimensional glow with overtones; cheap imitations show a single flat color.
• Professional verification. For certainty, a gemologist uses magnification, and X-ray can confirm a nucleus. This is the right step for any significant purchase.

For type-specific checks, see how to spot authentic dark pearls in the Tahitian pearls guide.

Disclosure: what a seller must tell you

Some processing is routine and needs no disclosure: drilling, polishing, buffing, cleaning and matching. Other treatments must be disclosed at the point of sale under CIBJO and US FTC rules because they affect value or permanence — bleaching, dyeing or tinting, irradiation (often behind "chocolate" pearls), heating, coating, filling, and luster enhancement such as "maeshori." Ask directly whether the color is natural and whether the pearl has been treated. A reputable seller answers plainly; evasiveness is your cue to walk away.

Certificates and where to buy

On higher-value pieces, look for a report from a respected laboratory — GIA, SSEF or Gübelin are the most credible for pearls, and a report matters most for confirming natural color and natural-versus-cultured identity. Treat unaccredited "in-house certificates" as marketing, not proof.

When choosing where to buy, favour a specialist who: names the species (Pinctada maxima, margaritifera or fucata), describes luster and surface honestly, states the grading system behind any "AAA" label, discloses treatments, and stands behind the piece. Be wary of "AAA per GIA" — GIA does not issue AAA grades, so that phrasing signals a seller who is loose with the facts. We explain pricing transparently in our guide to how much pearls are worth.

Matching the pearl to the piece you want

Finally, buy for the way you will wear it. For a strand, matching across the necklace matters as much as any single pearl — the eye reads the whole row, so even, consistent luster and color along the strand is what makes it feel fine. For studs, the two pearls should mirror each other closely; a mismatched pair is obvious at conversational distance. For a pendant or ring, a single pearl carries the whole piece, so spend your attention on that one pearl's luster and surface. And if you are designing something bespoke, start from loose South Sea pearls and choose each pearl yourself. Whatever the format, decide your priority — a flawless solo pearl, a perfectly matched pair, or an evenly graduated strand — before you compare prices, because that choice changes which pearl is the right buy.

Caring for your pearls after you buy

• Last on, first off. Put pearls on after perfume, hairspray and lotion, and remove them before contact with those products.
• Wipe after wear with a soft, slightly damp cloth, then let them dry before storing.
• Store flat and separate in a soft pouch, away from harder gems and metal that can scratch the nacre.
• Never use ultrasonic cleaners, steam, ammonia or abrasives. Mild soap and water on a soft cloth is all a pearl needs.
• Restring worn strands periodically, ideally knotted between pearls.

Frequently asked questions

How can you tell if pearls are real?

Real pearls feel slightly gritty when rubbed against a tooth edge or another pearl, show tiny natural surface irregularities, feel cool then warm to the touch, and have noticeable weight. Imitations are smooth, flawlessly uniform, and often lighter. These checks are a guide; an accepted lab report (GIA, SSEF, or Gübelin) is the only definitive proof.

What is the difference between cultured and natural pearls?

Both are real pearls made of nacre. A natural pearl forms with no human help and is extremely rare and expensive. A cultured pearl forms after a person inserts a nucleus into the mollusk; it is genuine and makes up almost all pearls on the market today.

Are cultured pearls real pearls? Yes. A cultured pearl is real nacre grown by a living oyster; culturing only refers to how the process is started. Under industry rules they are correctly described as "cultured."

How can I tell if my pearls are real at home? The tooth test (faint grittiness), tiny natural surface irregularities, a cool feel, real weight and a deep multidimensional glow all point to genuine nacre. For certainty, see a gemologist.

What is the most important thing to look for when buying pearls? Luster. It drives beauty and value more than any other factor, and a lustrous smaller pearl outperforms a dull larger one.

Do I need a certificate to buy pearls? Not for everyday pieces, but for high-value or natural-color purchases a GIA, SSEF or Gübelin report is the gold standard. We are explicit about whether color is natural on our pieces.

Where should I buy pearls? From a specialist who names the species, grades honestly, discloses treatments and explains pricing. Begin with white South Sea pearls, golden South Sea pearls, Tahitian pearls or Akoya pearls.

Ready to buy with confidence? Explore South Sea pearl necklaces, design with loose South Sea pearls, or read the full South Sea pearls guide at The South Sea Pearl.