How to Clean and Care for Gemstone Jewellery Safely

Most gemstone damage happens at home, not in transit — a stone that survived cutting, setting and shipping is far more likely to be chipped, clouded or loosened by the wrong cleaning method than by anything before it reached you.

The safest method, for almost everything

Warm (not hot) water with a few drops of mild, non-citrus dish soap, applied with a soft toothbrush, then rinsed and dried with a lint-free cloth. This is safe for essentially every gemstone and every setting, which makes it the right default whenever you're unsure.

Ultrasonic cleaners: safe for some, damaging for others

Ultrasonic cleaners use high-frequency sound waves to shake loose dirt — the same vibration that lifts grime can also loosen a stone in its setting, widen existing fractures, or strip a fracture-filled or dyed stone of its treatment. As a rough guide:

• Generally safe — diamond, sapphire, ruby (untreated or standard heat only), spinel, alexandrite and other chrysoberyl, and most untreated quartz varieties (amethyst, citrine).
• Never use an ultrasonic cleaner on — emerald (almost always oiled or fracture-filled — see our treatments guide), tanzanite, opal, pearl, turquoise, topaz, tourmaline, peridot, aquamarine, or any stone you know or suspect has been fracture-filled, dyed or coated, regardless of species.

Setting style changes the risk

Bezel and channel settings absorb and distribute vibration far better than exposed prong settings, which leave a stone more vulnerable to being knocked loose during ultrasonic cleaning or everyday wear. Before ultrasonic cleaning anything, check under magnification that the stone sits tight in its setting with no visible cracks — and check again afterwards.

Storage matters as much as cleaning

Store stones of different hardness separately (see our Mohs hardness guide) — a diamond or sapphire left loose alongside softer stones like opal, pearl or emerald will scratch them over time even without ever touching during wear, simply from contact in a jewellery box. Individual soft pouches or a lined, compartmentalised box are worth the modest cost.

When to see a professional instead

Any stone with a visible crack, a loose setting, or unknown treatment history is a job for a jeweller with proper equipment, not a home ultrasonic cleaner. A professional steam clean or careful hand-clean, followed by a prong/setting check, is the right call for anything valuable or uncertain.

Related reading

• Mohs hardness scale: which gemstones are safe for everyday wear
• Gemstone treatments explained
• Non-diamond engagement rings guide

Sources: gemstone-specific ultrasonic safety guidance consolidated from multiple trade jeweller references, cross-checked against the treatment-sensitivity facts already established in our own treatments guide.