Here’s a clear, practical guide used by jewelers to tell real pearls, shell pearls, and plastic beads apart. No special tools needed for most tests.

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1. What They Are (Quick Definition)

• Real pearls (natural or cultured)
  Formed inside a mollusk with layers of nacre. Includes freshwater and saltwater pearls.

• Shell pearls
  Man-made beads, usually from crushed shell or mother-of-pearl powder, coated to imitate pearls.

• Plastic beads
  Synthetic imitation pearls made from plastic with a pearly finish.

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2. The Tooth Test (Most Reliable at Home)

Gently rub the pearl against the edge of your front tooth.

• Real pearl → feels gritty or sandy

• Shell pearl → slightly smooth, lightly chalky

• Plastic bead → very smooth, glassy

🔹 Why it works: Real nacre has microscopic layers that create texture.

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3. Surface Inspection (Very Important)

Look closely under good light or a magnifier.

• Real pearl

  • Tiny imperfections

  • Slight ripples or uneven surface

  • No two pearls are exactly the same

• Shell pearl

  • Very uniform

  • Often “too perfect”

  • Coating may look painted

• Plastic bead

  • Obvious mold lines or seams

  • Peeling or flaking finish

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4. Weight Test (In the Hand)

Compare pearls of similar size.

• Real pearl → heavier than it looks

• Shell pearl → medium weight

• Plastic bead → very light

Plastic almost always feels suspiciously light.

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5. Temperature Test

Touch the pearl to your skin or lips.

• Real pearl → cool at first, warms slowly

• Shell pearl → cool briefly

• Plastic bead → warm immediately

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6. Drill Hole Examination (If Strung or Loose)

Look at the hole where the string passes through.

• Real pearl

  • Sharp-edged hole

  • Nacre visible, layered look

• Shell pearl

  • Rounded hole

  • Coating may look thin or chipped

• Plastic bead

  • Rough hole

  • Peeling or plastic residue

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7. Luster Test (Light Reflection)

Rotate the pearl under light.

• Real pearl

  • Deep, soft glow

  • Light seems to come from within

• Shell pearl

  • Bright but shallow shine

• Plastic bead

  • Flat, artificial reflection

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8. Bounce Test (Hard Surface – Optional)

Drop gently from a few inches onto glass or stone.

• Real pearl → slight bounce

• Shell pearl → minimal bounce

• Plastic bead → dull drop

⚠️ Use caution to avoid damage.

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9. Price & Context Check (Business Reality)

• Very low price + “perfect pearls” = likely shell or plastic

• Large, perfectly round pearls at cheap prices are never natural

• Trusted sellers disclose pearl type clearly

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Quick Comparison Table

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Professional Confirmation

For high-value pieces:

• X-ray test (shows nacre layers)

• Gem lab certification (GIA, NGTC, etc.)