Why Soft Gemstones Need a Gentler Touch

Most of us were taught that jewellery cleaning means a bowl of warm water and a splash of washing-up liquid. For diamonds, sapphires and gold, that advice works beautifully. For opals, pearls, turquoise, amber, coral, lapis and malachite, it can quietly ruin a treasured piece.

The Mohs scale measures how well a stone resists scratching, and it's a useful starting point. Pearls sit at just 2.5 to 4.5, opals around 5.5 to 6.5, and turquoise roughly 5 to 6. But hardness isn't the whole story. Many softer gemstones are also porous or water-sensitive, which means they can absorb oils, cosmetics and dyes, or crack when exposed to rapid changes in temperature.

Ultrasonic cleaners, steam cleaners, ammonia dips, vinegar, toothpaste and alcohol wipes all belong firmly on the "never" list. The good news is that gentle cleaning takes only a few minutes and uses things you already have at home.

The Only Cleaning Kit You Really Need

Keep it simple and keep it soft. You'll need:

• A small bowl of lukewarm water — never hot
• A drop of mild, pH-neutral, unscented washing-up liquid, or none at all for pearls and turquoise
• Two soft, lint-free cloths, such as microfibre or well-washed cotton
• A very soft baby toothbrush or a make-up brush with synthetic bristles
• Kitchen roll or a dry towel to rest pieces on

Avoid anything abrasive, anything perfumed, and anything designed for silver or gold dips. If you're unsure whether a product is safe, assume it isn't. When in doubt, use less water, less product and less rubbing.

Cleaning Opals Without Clouding Them

Opals hold between three and ten per cent water within their structure, and that water is part of what gives them their play of colour. Soaking them is a bad idea, and so is drying them near a radiator, on a sunny windowsill or with a hairdryer. Sudden temperature changes can cause fine cracks known as crazing, and once that happens it can't be reversed.

To clean an opal, dampen a soft cloth so it is barely moist, wipe the stone gently, then dry it straight away with a second dry cloth. Don't use oils, and don't scrub the setting with a brush. For storage, a soft pouch in a room with normal humidity is ideal. Airtight boxes and very dry safes left unopened for months are best avoided — opals like a little moisture in the air around them.

Pearls: The Most Delicate of All

Pearls are formed from nacre, which is soft and easily damaged by acids found in perfume, hairspray, cosmetics and even perspiration. The golden rule of pearl wearing is last on, first off: put your pearls on after your skincare and scent have dried, and take them off before you undress or get ready for bed.

After each wear, wipe them with a soft, slightly damp cloth to remove skin oils, then lay them flat to dry completely. Never soak pearls, never hang a wet strand to dry, and never use soap, which can dull the surface. Silk thread weakens over time, so if you wear a strand often, have it restrung roughly once a year. Store pearls in a soft pouch or a fabric-lined compartment rather than a sealed plastic bag — they need a touch of humidity to stay lustrous.

Turquoise and Other Porous Stones

Turquoise, lapis lazuli, malachite, howlite, amber and coral are all porous to some degree. Turquoise is particularly absorbent: hand cream, sun lotion, hair oil and even dye from a new jumper can seep in and change its colour permanently.

Clean these stones with a barely damp cloth and nothing else — no soap, no soaking, no brushing around the settings. Pat dry rather than rub, and let the piece air for a few minutes before putting it away. The best protection is prevention: apply moisturiser and perfume first, let them settle, then put your jewellery on. Take rings off before gardening, swimming or washing up.

Storing Your Collection So They Don't Damage Each Other

Most damage to soft gemstones happens in the jewellery box, not on the wrist. A few habits make a real difference:

• Give every piece its own soft pouch or fabric-lined compartment — never pile them together
• Keep harder stones such as diamonds and sapphires well away from opals, pearls and turquoise
• Store away from radiators, sunny windowsills and damp bathrooms
• Skip airtight plastic bags and loose cotton wool, which can catch on clasps and settings
• Use silica gel sachets for most pieces, but not for long-term storage of pearls or opals
• Check clasps, stringing and settings every few months, and travel with pouches inside a hard case

Treat these gentler gemstones as you would a fine silk scarf: handled with care, cleaned little and often, and kept somewhere kind. Done that way, an opal's fire, a pearl's glow and turquoise's calm colour will stay with you for decades.