How to Care for Pearl and Gemstone Jewelry: A Guide for US Owners

Pearls Are Not Like Other Gemstones — and That Changes Everything

Most jewelry care advice gets written for diamonds and sapphires. Those are minerals, hard and stable, sitting at 9–10 on the Mohs hardness scale. Pearls are something else entirely. They are organic — grown layer by layer inside a mollusk — and rank only around 2.5 to 4.5 on that same scale. That puts them softer than a copper penny. The nacre coating that gives pearls their signature glow is a biological composite of aragonite crystals and proteins, which means it reacts to its environment in ways a ruby or emerald simply does not.

This distinction matters the moment you reach for a cleaning product. Ammonia, bleach, vinegar, and hydrogen peroxide — all common household cleaners — can erode nacre, causing pearls to dull, discolor, or crack. The same goes for everyday beauty products. Perfume, hairspray, moisturizer, and even perspiration can gradually degrade the pearl’s surface. The practical rule that follows from this: put your pearl jewelry on last when getting dressed, and take it off first when you return home.

Gemstone pieces that combine pearls with harder stones — emerald-and-pearl necklaces, for instance, or ruby-accented strands — need to be treated according to the most delicate element present. A pearl set alongside diamonds should be cleaned as a pearl piece, even though the diamonds could handle far more aggressive methods. When in doubt, the damp-cloth method is always the safer default.

Cleaning: What Actually Works (and What Will Ruin Your Piece)

For routine cleaning after each wear, a soft lint-free cloth is all you need. Wipe the pearls gently to remove any residue from skin oils, cosmetics, or perspiration. This single habit, done consistently, does more to preserve luster than any deep-cleaning session.

For a more thorough clean — say, after a summer event or if the piece looks visibly dull — use lukewarm water with a single drop of pH-balanced, mild soap. Dip a soft cloth or a soft-bristled brush into the solution, wipe the pearls carefully, then rinse with a separate damp cloth. Never submerge a pearl strand in water. The silk thread that holds the pearls together can weaken, stretch, and eventually snap if soaked. After cleaning, lay the necklace flat on a soft towel and allow it to air dry completely before storing — putting it away damp invites mold and weakens the stringing material.

One piece of equipment to avoid without reservation: ultrasonic cleaners. These devices use high-frequency sound waves to create cavitation bubbles in a cleaning solution. For pearls, those vibrations can strip away nacre, cause cracking, and in severe cases begin to delaminate the layers entirely. The GIA explicitly warns against using ultrasonic or steam cleaners on pearls. The same caution applies to several gemstones that share pearls’ porous or inclusion-prone nature. Emeralds are frequently oil-treated to improve clarity; ultrasonic vibrations can cause that filler to leak or cloud. Opals contain water within their structure and can crack under heat and vibration. Turquoise is porous and may absorb cleaning chemicals, permanently altering its color. For these stones, warm soapy water and a soft brush remain the correct approach.

For harder, untreated stones like sapphires, rubies, and most diamonds, ultrasonic cleaning is generally safe — but always confirm whether a stone has been treated before proceeding. Heat-treated sapphires or fracture-filled diamonds can suffer under the same process that would be harmless to a natural, untreated stone.

Storage: The Mistakes That Damage Jewelry Slowly

The most common storage error is also the most invisible: tossing multiple pieces into the same drawer or compartment. Harder gemstones will scratch softer ones on contact. A diamond ring resting against a pearl bracelet will, over time, abrade the nacre in ways that are permanent — pearls cannot be polished back to their original surface the way harder stones can.

Store each piece separately in a soft-lined pouch or individual compartment. Chamois leather, silk, and velvet are all suitable materials. For pearl necklaces specifically, avoid hanging storage: the weight of the strand stretches the silk thread over time, creating slack and accelerating wear near the clasp. Lay pearl necklaces flat, with the clasp fastened.

Two other storage conditions worth watching in US homes, particularly during summer and winter:

• Airtight containers and plastic bags are a problem for pearls. Pearls are slightly porous and need some atmospheric moisture and airflow to stay healthy. Sealing them away causes dehydration, which eventually leads to cracking and brittleness. A fabric-lined jewelry box left partially accessible is better than a sealed plastic case.
• Prolonged heat and direct sunlight degrade nacre. A windowsill, a car glove compartment in July, or a spot near a heating vent in January can all cause discoloration and surface damage. The same applies to color-sensitive gemstones like amethyst, aquamarine, and citrine, which can fade under sustained UV exposure.

For gemstones like turquoise, an additional step is worth taking: store the piece away from other jewelry entirely, not just in a separate compartment, since contact can cause color transfer. And avoid soap on turquoise altogether — surfactants can penetrate its porous surface and alter its color.

Restringing and Professional Maintenance

Pearl necklaces and bracelets strung on silk thread need periodic restringing — this is one of the most overlooked aspects of pearl care in the US. The silk weakens with wear, body oils, and moisture exposure. Natural body oils and fragrance residue cling to the thread and can begin damaging the pearl at the drill hole, causing discoloration from the inside out.

For frequently worn pieces, having them restrung every 12 to 18 months by a professional jeweler is a reasonable guideline. Less frequently worn strands can go two to three years, but inspect the thread regularly for visible slack, fraying, or gaps forming beside the knots. A well-strung necklace will have a small knot between each pearl — this serves two purposes: it prevents the pearls from rubbing against each other (which causes surface wear), and it ensures that if the strand breaks, only a single pearl is lost rather than the entire necklace scattering across the floor.

Restringing is also a practical opportunity to inspect clasps, check for any pearls that have developed surface damage, and have a jeweler assess the overall condition of the piece. For pearl-and-gemstone combination pieces — the kind where emeralds, rubies, or sapphires are set alongside pearls in a single necklace — a jeweler can also check whether any settings have loosened.

Beyond restringing, scheduling a professional inspection every one to two years makes sense for any fine pearl or gemstone piece. Some tasks, like removing deep-set stains or addressing pearls that have lost significant luster, are genuinely better handled by someone with the right tools and experience.

Daily Habits That Add Up Over Time

The difference between a pearl necklace that looks worn after five years and one that still has its original glow after twenty usually comes down to small, consistent habits rather than any single cleaning session.

Remove pearl and gemstone jewelry before exercising, swimming, or doing household chores. Chlorine in pools degrades nacre. Sweat during a workout introduces acids to the surface. Household cleaners — even mild ones — can cause cumulative damage. Take the pieces off before a shower, not after.

And counterintuitively, wearing your pearls regularly is better for them than leaving them stored. Pearls kept in a box for months at a time tend to dehydrate and become brittle. The slight natural moisture of skin contact helps condition the nacre. This is particularly relevant for US owners who might reserve pearl jewelry for formal occasions and leave it untouched for long stretches between events.

If you own pieces that combine pearls with natural gemstones — the kind of designs found in Mangatrai’s pearl and gemstone collection — the same principles apply: clean gently, store separately, and let the most delicate material in the piece set the standard for how everything is handled. For those exploring Akoya, South Sea, Tahitian, or freshwater pearl pieces, Mangatrai’s full pearl collection offers a range of certified options across pearl types, each of which benefits from the care practices outlined here.

The underlying logic across all of this is consistent: pearl and gemstone jewelry is an investment in material that responds to its environment. Heat, chemicals, abrasion, and dehydration all work against it slowly and silently. Attention to storage, a soft cloth after each wear, and a professional inspection once in a while are what keep these pieces looking the way they did on the day you first put them on.