The short answer
Most pearls sold today are cultured pearls, which are real pearls grown with human help. Natural pearls, which formed without help, are rare. Imitation pearls are man-made beads with a pearly coating. Gentle home checks can often tell imitations from real pearls, but they cannot separate natural from cultured pearls, or identify treatments. For that, and for anything that may be valuable, use a qualified jewelry appraiser or a gemological laboratory.
1. The tooth test
Gently rub a pearl against the edge of your front teeth, or rub two pearls together lightly. Real pearls, natural or cultured, usually feel slightly gritty or sandy because of the layered surface. Many imitations feel smooth or glassy. Some high-quality imitations are made to feel gritty, and the coating of a real pearl can be worn, so treat this as a clue only. Clean the pearls first, and be gentle; pressing hard can damage the surface.
2. Look at the surface
Use a magnifier or your phone's camera zoom in daylight.
- Small irregularities: real pearls often show tiny bumps, ridges or spots. A surface that is perfectly uniform on every pearl can suggest an imitation.
- Luster: real pearls tend to show a deep, sharp reflection that seems to come from within. Imitations may look flat, chalky or overly shiny.
- Shape and size variation: even well-matched strands of real pearls usually show slight differences in shape, size and color from pearl to pearl.
3. Check the drill holes
The drill holes are one of the most useful places to look. On imitations, the coating often chips, peels or bunches around the hole, and you may see glass or plastic underneath. Real pearls usually have sharp, clean edges, and you may see the layered nacre or a line between nacre and the bead nucleus inside a cultured pearl. Wear around the hole is common on old strands of any kind, so look at several pearls.
4. Feel the weight and temperature
Real pearls often feel cool to the touch at first and warm up slowly on the skin. Plastic imitations tend to feel light and warm quickly, while glass imitations can feel heavy and stay cool. These are rough clues and easy to misread, especially on short strands or single pearls.
5. Look at the stringing and clasp
Quality pearl strands are often knotted between each pearl to prevent rubbing and loss if the string breaks. The clasp may be marked with a metal stamp, such as 14K or 925, or a maker's mark. Knotting and a gold clasp suggest someone valued the strand, but they are not proof the pearls are real. Imitation pearls are sometimes knotted too, and real pearls are sometimes restrung on cheaper clasps.
6. Tests to avoid
Do not scratch pearls with a knife, test them with a flame, or put them in vinegar or other acids. These methods can permanently damage real pearls. Avoid ultrasonic cleaners and harsh chemicals as well.
7. When to use a lab or appraiser
If home checks suggest real pearls, a qualified appraiser can describe the type, size, luster, surface and matching, and value the piece for insurance or sale. Telling natural from cultured pearls usually needs laboratory equipment such as X-ray imaging. A lab report is worth considering for any strand that might be natural or comes with a family story of being old and valuable.
Watch for seller red flags
- "Genuine pearls" with no details about type, size or origin.
- Perfectly identical pearls with a very low price.
- No close-up photos of the surface, drill holes or clasp.
- Claims of "natural pearls" with no laboratory report.
If you are selling pearls, describe what you know and how you know it. "Tested by a jeweler as cultured pearls" is far more useful to a buyer than "real pearls" with no explanation, and it helps avoid disputes later.
Where WorthAI fits
WorthAI can help you identify the likely type of piece from a photo and see what similar items sell for, with the listings behind the estimate. The estimate assumes the pearls and metal are what they appear to be. WorthAI cannot test pearls and is not an authentication service, so use an appraiser or lab for confirmation.
Frequently asked questions
Is the tooth test accurate?
It is a useful clue, not proof. Real pearls usually feel gritty and many imitations feel smooth, but some imitations are made to feel gritty.
Are cultured pearls real pearls?
Yes. Cultured pearls grow inside mollusks with human help. They are real pearls, unlike imitation pearls, which are man-made beads.
How can I tell natural pearls from cultured ones?
Usually only a gemological laboratory can tell, using specialized imaging to look inside the pearl.
Can WorthAI tell if my pearls are real?
No. WorthAI identifies the likely piece and estimates value assuming it is as described. An appraiser or lab needs to confirm what the pearls are.