Thread Ages, Even When the Pearls Do Not

A pearl necklace may look flawless from across the room, but the part doing most of the work is the one you cannot see. Silk thread, traditionally used because it is soft enough not to abrade delicate nacre, is a natural fibre. It stretches under the weight of a full strand, absorbs skin oils, perfume and hairspray, and weakens over time. Pearls themselves are remarkably durable when cared for, but they sit at roughly 2.5 to 4 on the Mohs scale, so any thread that allows them to knock against one another is doing real damage.

Restringing is not a repair you do once and forget. It is routine maintenance, like having a favourite watch serviced or reheeled. Knowing the warning signs helps you decide when to book it in, and a good restring is often the cheapest way to protect an expensive strand.

Warning Signs That the Thread Is Failing

Most problems announce themselves quietly before they become dramatic. Run through this list every few months, ideally with good light and a clean hand mirror.

• Visible gaps between the knots when the necklace hangs loosely. If you can see daylight between a knot and the neighbouring pearl, the silk has stretched and the pearls are moving more than they should.
• Fraying, fuzziness or a flattened look at the thread by the clasp, where tension is greatest.
• Knots that slide or stray lengths of thread poking out between pearls.
• A strand that no longer lies flat when placed on a table, curling or kinking instead of forming a smooth arc.
• Discolouration of the thread — grey, yellow or brownish sections usually mean oils, sweat and cosmetics have worked their way in.
• Grubby residue on the thread and around the drill holes, which is a sign the strand needs cleaning as well as restringing.
• A clasp that has become stiff, loose or sharp-edged, or a small metal loop (the gimp, sometimes called French wire) that has crushed or broken.
• A sudden slackness after a hot summer or a period of daily wear — silk can lose its spring quite quickly.

If a strand breaks and the pearls are knotted individually, you will usually lose one pearl — the one nearest the break — rather than the lot. On an unknotted strand, a single break can send pearls across the floor. That difference alone is why knotting matters.

How Often Should Pearls Be Restrung?

There is no single rule, because wear matters far more than age. As a practical guide for UK wearers:

• Daily wear: restring every 12 to 18 months.
• Regular wear, a few times a week: every two years.
• Occasional wear, perhaps a handful of times a year: every three to five years, and sooner if you notice any warning signs.
• Stored, unworn strands: still worth checking every few years. Silk can degrade with damp, heat and poor storage even without use.

Heavier strands, larger pearls, long ropes and anything with a heavy clasp will need attention sooner. Very fine thread in a delicate two-millimetre strand also has less material to spare than the robust silk used on a chunky nine-millimetre necklace.

What a Professional Restring Involves

A proper restring is more than passing new thread through the pearls. The strand is taken apart, the pearls are cleaned carefully, and any that are cracked, chipped or badly worn are identified and set aside for discussion. Fresh silk is then knotted by hand between each pearl, with the knot sitting snugly enough to prevent rubbing but not so tight that it strains the drill holes. Thread diameter is chosen to suit the pearl size and hole, and the gimp at the clasp is replaced so the metal does not saw through the silk.

Graduated strands are re-laid in their original order, which is why it is worth photographing the necklace laid flat before it goes anywhere. Longer strands may be re-knotted onto the original clasp, and clasps can be swapped for something more secure if the old one is worn. Expect the finished strand to feel slightly firmer and to drape a little differently — that is the thread doing its job again.

Caring for Pearls Between Restrings

A few habits will extend the life of the thread considerably.

• Put pearls on last when dressing and take them off first at night, after perfume, hairspray and lotions have settled.
• Wipe the strand with a soft, dry cloth after wearing to remove skin oils from the thread and nacre.
• Store flat, in a soft pouch or lined box, rather than hanging. Hanging places continuous tension on the silk.
• Keep pearls away from radiators, sunny windowsills and damp cupboards, and never seal them in plastic.
• Avoid ultrasonic cleaners and harsh chemicals, which damage both nacre and thread.

Restrung Pearls and Rustic-Inspired Styling

A freshly knotted strand has a pleasing weight and movement that suits relaxed, textured styling. Think undyed linen, oatmeal wool, raw silk and soft brown leather. A simple pearl necklace over a collarless linen shirt, or layered with a thin leather cord and a single oddment of antique brass, reads as considered rather than fussy. Cream and warm white pearls sit beautifully against earthy tones — clay, sage, rust, charcoal — while a strand of slightly baroque, irregular pearls looks especially at home with hand-thrown ceramics and natural fibres.

If you are mixing pearls into a rustic-inspired wardrobe, keep the metal honest: aged brass, oxidised silver, copper. And keep the pearls in good order. A strand with tight, clean knots and a sound clasp will hold its own against coarse linen and chunky knitwear; one with stretched thread will look tired no matter how well it is styled. When in doubt, ask a jeweller to look at the strand before the season starts, so you are wearing it rather than worrying about it.