The Systematic Maintenance of Pearl Jewellery

Why Pearls Need Different Care

Pearls are different from most gemstones because they are organic and formed inside living mollusks. To understand how this affects their care, you can also refer to our guides on pearl types and the pearl glossary.

• Organic Bio-composite Structure: Unlike inorganic gemstones formed by geological pressure, pearls are biogenic materials produced by living mollusks. They are composed of approximately 95% aragonite, similar to calcium carbonate (CaCO3), and 5% conchiolin, a fibrous protein, along with water.
• The Nacre Vulnerability: The structural integrity of nacre is derived from its "brick-and-mortar" type nano-construction. Aragonite occurs as hexagonal platelets, only a few hundred nanometres thick, which are stacked in a dense, organized arrangement.

  These platelets are bonded by conchiolin, a complex fibrous protein that serves as the organic mortar. The pearl's lustre and "orient" (iridescence) result from light reflecting off microscopic aragonite platelets. Because these platelets are bound by an organic protein, conchiolin, the mortar in this case, the surface is highly porous and reactive to chemicals, temperature cycling, and dehydration.

  Think of it as a chalky or bony substance. We all know that in touch with moisture or chemicals, all such substances are prone to damage. Pearls also become prone to damage when there is no moisture. So, they should be stored in a place where adequate humidity and chemical free atmosphere is there.

• Hardness Disparity: Ranking only 2.5 to 4.5 on the Mohs scale, pearls are significantly softer than the quartz found in household dust (Mohs 7.0) or common gemstones like sapphires and diamonds. This low hardness makes them susceptible to immediate surface scratching and mechanical abrasion.

The following precautions should be taken to protect the pearls and make them last longer. For a deeper understanding of why pearls behave this way, you can refer to our pearl glossary.

1. The Most Important Rule: Pearls Are Worn Last

• "Last On, First Off" Protocol: This fundamental rule mitigates exposure to the complex solvents found in modern beauty products.
• Chemical Attack Mechanisms: Ethanol and other volatile solvents in perfumes do not simply sit on the surface; they can dissolve the conchiolin matrix, leading to "pitting" (microscopic holes) and a flat, chalky appearance that cannot be restored without risky repolishing.
• The 30-Minute Rule: Professional advice suggests applying makeup, hairspray, and perfume at least 30 minutes before putting on pearls to ensure all harmful volatile compounds have completely evaporated from the skin.

2. How to Clean Pearl Jewellery Safely

• The Post-Wear Ritual: After every wear, pearls should be wiped with a clean, lint-free microfiber or soft cotton cloth. Microfiber is preferred as its fine fibers trap skin oils and acids before they can etch the nacre.
• Safe Aqueous Cleaning: For localized soil, use lukewarm distilled water mixed with one drop of pH-neutral, non-detergent soap, such as baby shampoo or Ivory.
  • Method: Dampen the cloth, wring it until it is nearly dry, and wipe each pearl individually.
  • Knot Care: Use a barely damp cotton swab to lift grime from the knots between pearls, taking care not to fray the thread.
• Crucial Drying Phase: Lay the strand flat on a dry towel and allow it to air-dry for several hours or overnight before storage. Moisture trapped in the drill holes or silk thread can cause the string to stretch, rot, or attract internal dirt.

3. What Damages Pearls Over Time

• Chemical Erosion: Acids and surfactants in sunscreens, lotions, and detergents can erode the nacre layers, causing irreversible yellowing or darkening.
• The Dehydration Hazard: Pearls contain a natural moisture content (2–4% water) essential for their structural integrity. Overly dry environments, such as safety deposit boxes or areas near heating vents, cause the nacre to "craze", develop fine cracks, and become brittle.
• Perspiration and Skin pH: Sweat is acidic; if not wiped away, it can crystallize within the nacre's pores, leading to micro-abrasion and a "foggy" surface film.
• Metal Oxidation: If pearls are strung with gold beads, the larger drill holes in the metal can allow beads to slip over knots and contact the nacre directly. This often results in black stains caused by the invisible oxidation of the gold transferring to the pearl.

4. How to Store Pearl Jewellery Properly

• Isolation Strategy: Store each piece in its own breathable fabric pouch, silk, cotton, or velvet, to avoid contact with harder jewellery that can scratch the nacre.
• Humidity Management:
  • The Humidor Effect: In dry climates, place a barely damp cotton ball or a small glass of water near the jewellery storage area, not in direct contact, to maintain ambient humidity.
  • Unfinished Wood: A cedar cigar box can act as a natural moisture regulator, absorbing and releasing humidity to protect the biogenic layers.
• Avoid Airtightness: Never use plastic bags or airtight containers, which trap dry air and prevent the pearls from "breathing", ultimately accelerating dehydration. For understanding this behaviour, refer to our pearl glossary.

6. How Often Should You Clean and Maintain Pearls

• Daily: A 30 to 60 second wipe down after every wear to stabilize surface pH and remove oils.
• Monthly or Seasonally: Inspect the strand for visible gaps or discoloured thread.
• Yearly: Professional "MOT", Maintenance, Organization, and Testing, is recommended. A jeweller will check the integrity of settings, clean deep seated residues, and assess the strength of the stringing material.

7. Special Care for Different Pearl Jewellery Types

• Strung Necklaces and Bracelets: Always store these flat. Hanging them on a jewellery stand causes gravity to stretch the silk or nylon thread, creating unsightly gaps.
• Rings and Earrings: These are often "half-drilled" and secured with specialized jewellery adhesive.
  • Adhesive Risk: Hot water, steam, and chemical solvents can dissolve the glue, causing the pearl to fall out.
  • Impact Exposure: Rings suffer the most physical impact; they should be removed before any manual activity or hand-washing.
• Species-Specific Durability: Akoya pearls have thin nacre, 0.35–0.7mm, and can "blink", show the shell nucleus, if worn down. South Sea pearls, 2.0–6.0mm nacre, and Freshwater pearls, solid nacre, are generally more resilient to long-term wear. For more context, read our pearl types guide.

8. Common Mistakes People Make with Pearls

• High-Tech Destruction: Ultrasonic and steam cleaners are categorically destructive to pearls. Vibrations can delaminate nacre layers, and intense heat can cause splitting or cracking.
• The "Natural Cleaner" Myth: Vinegar, lemon juice, and baking soda are acidic or abrasive. Because pearls are calcium carbonate, they will chemically react, fizz, and dissolve when exposed to these substances.
• Aquatic Exposure: Swimming in chlorinated pools or the ocean can strip the lustre and damage the internal silk thread.

9. Travel Care for Pearl Jewellery

• Carry-On Only: Airport cargo holds are subject to extreme temperature fluctuations and low humidity, which can cause pearls to crack. Always keep them in your carry-on luggage.
• Packing Hacks: Thread necklaces through a drinking straw or wrap them in a microfiber cloth roll to prevent tangling and friction.
• Hotel Safety: Avoid leaving pearls on bathroom counters where they are exposed to the aerosolized chemicals of other guests' toiletries.

10. When to Restring or Professionally Maintain Pearls

• Frequency: Strands worn once a week should be restrung every 1–2 years; occasional pieces may last 3–5 years.
• Warning Signs of String Failure:
  • Fuzzing/Fraying: The silk thread appears shredded or "wooly" at the drill holes.
  • Stretching: Visible gaps between the pearls and the knots, or the necklace hanging longer than its original length.
  • Knot Disappearance: The knots have shrunk or stretched enough to slip inside the pearl's drill hole.
• Why Professional Knotting Matters: A professional restring puts a knot between every pearl. This prevents the gems from rubbing against each other and ensures that if the strand breaks, you only risk losing a single pearl rather than the entire collection.

FAQs on Pearl Jewellery Care