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Ultrasonic cleaner jewellery limits

Updated: 2026-10-21

A listing that says “jewellery” is not permission to drop every piece into the tank. An ultrasonic cleaner jewellery cycle can brighten plain gold, silver, or a hard stone in a sound setting, and the same cycle can split a pearl, craze an opal, or shake out a stone held only by dirt. A 10 litre bath does not change that list. It means you heat a lot of water for a small load. Watt shopping stays on the [10 litre ultrasonic cleaner buying guide](/hub/workshop/10l-ultrasonic-cleaner/sub/10l-ultrasonic-cleaner-buying-guide). Prices are on the [10L ultrasonic cleaner comparison](/hub/workshop/10l-ultrasonic-cleaner). Products Compared used National Association of Jewellers guidance, GIA’s gem note, and UK jeweller pages, not a soak test.

A listing that says “jewellery” is not permission to drop every piece into the tank.

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DK SONIC DK SONIC DK-1000HP-IE

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DK SONIC DK SONIC DK-1000HP-IE
6.1/10about £209.99
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SDKEHUI SDKEHUI 10L digital

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SDKEHUI SDKEHUI 10L digital
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On this page
  1. 1.What a large bath does not change
  2. 2.Stones and pieces to keep out
  3. 3.Metals and hard stones that may go in
  4. 4.A short cycle, not a workshop heat

What a large bath does not change

Seller bullets mention jewellery because a basket will hold several chains. SDKEHUI B0C4FHLQD4, at £124.99, still says some jewels should be used with caution. DK SONIC listings name gold and silver. Volume does not make cavitation gentler. A 10 litre fill is a poor tool for one ring. The empty machine weighs about 6 to 7 kg. The large tank earns its place for a handful of plain chains or several sound gold bands, not a box of unknown stones. These baths often reach 80 °C because a carburettor fluid sometimes asks for that. Jewellery is not that job. If that fluid is already in the tank, drain it and start again. The oily-parts sequence is on the carburettor page, and it should stay there.

Stones and pieces to keep out

Pearls, opals, and amber stay out. The National Association of Jewellers says never to ultrasonic-clean them, and not to submerge them. Coral sits with that group. A “gentle” setting is still an ultrasonic bath. Emerald, turquoise, lapis, and other porous stones belong on the same shelf. EJ Ultrasonics puts those stones, and glued costume jewellery, on the do-not side. GIA adds fracture-filled stones and anything oiled or waxed. A fracture-filled diamond is not “just a diamond”. If you do not know the treatment, leave it out. Glued pieces come apart as the vibration works into the glue. Foil-backed and hollow pieces you cannot see inside are the same risk. If you cannot name the stone, do not guess from the colour. Ask a jeweller rather than test the only example you own.
DK SONIC DK SONIC DK-1000HP-IE

Testsieger

DK SONIC DK SONIC DK-1000HP-IE
6.1/10about £209.99
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Metals and hard stones that may go in

Plain gold, silver, and platinum, without stones, are the usual yes. EJ Ultrasonics names those metals, and diamond, sapphire, and ruby, as the pieces a jewellery bath is normally used for. DK SONIC bullets that mention gold and silver point at this group, not at a pearl strand sold beside them. Hard stones in sound claws can follow. Nicholas Wylde’s UK advice is that diamond, sapphire, and ruby settings can be cleaned, and that a stone held only by dirt can fall out once that dirt has gone. A missing tip or a spinning stone means a jeweller tightens it, not the tank. Treated stones stay out. One UK text on B0C4FHLQD4 says a watch chain came clean. A chain is a metal job, not evidence for the stone in a signet ring.

A short cycle, not a workshop heat

Use a mild water-based fluid, or a drop of washing-up liquid if the manual allows it, and keep the temperature moderate. Do not copy a 50 to 80 °C carburettor band onto a ring. Durston’s usual 40 to 60 °C, with a warning against long runs at 80 °C, is already warmer than a delicate piece needs. Degas fresh water before the pieces go in, basket empty, until the bubble streams ease. That step is on how to use an ultrasonic cleaner. Then put only pieces that passed the test into the basket. Nothing sits on the tank floor. Lift them out while the cycle is still short, rinse, and dry. These machines do not sterilise. If the piece is valuable, unnamed, or already damaged, a jeweller’s clean costs less than a split opal.

Common questions

Can pearls go in an ultrasonic cleaner?
No. The National Association of Jewellers says never to ultrasonic-clean pearls, and not to submerge them. Coral and amber sit with that warning. A shorter cycle or a 10 litre bath on a low setting does not create an exception. Use the cloth method a jeweller gives you.
Can an opal ring go in?
No. NAJ includes opals with pearls and amber as gems that must not go through ultrasonic cleaning. Opal can craze. Leave the ring out even if the mounting is plain gold. Clean any other gold only after the opal piece has been removed.
Can a plain gold band go in?
Yes, if it is plain metal with no stones, no enamel, and no hollow construction you are unsure about. Gold, silver, and platinum are the metals UK ultrasonic firms usually name. Use a mild fluid, a moderate temperature, and the basket, then rinse and dry. A band with a stone is a different question.
What about diamonds, sapphires, and rubies?
A hard stone in a sound claw can be cleaned, which is the line from EJ Ultrasonics and Nicholas Wylde. Check the claws first. GIA says fracture-filled diamonds and oiled or waxed stones do not belong in the bath. Emerald is on the avoid list even when the colour looks sound.
Will the vibration shake a loose stone out?
It can. Nicholas Wylde notes that a stone held only by dirt can fall out once that dirt is gone. A spinning stone or a missing claw tip needs a jeweller first. Do not use the bath as the test of whether the setting is sound.
Is a 10 litre tank a good jewellery cleaner?
Only when you have several safe pieces at once. One ring does not need a 10 litre fill. The stone rules are identical to a small cup. Buy this size for a batch of plain metal, not because a listing prints the word jewellery. Do not run rings at carburettor heat, and do not use carburettor fluid in the same water.
What if I do not know the stone?
Leave it out. A stone you cannot name might be a pearl, an opal, a treated gem, or glued paste. NAJ’s ban and GIA’s warning about treatments both assume you know what you are holding. A jeweller can identify it. A test dip cannot.

Related pages

Best 10L ultrasonic cleaner UK

10L ultrasonic cleaner

10L ultrasonic cleaner buying guide: litres and watts

Ultrasonic cleaner carburettor: fluid, heat, basket

How to use a 10L ultrasonic cleaner: first safe cycle

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Updated October 2026.

  1. GOV.UK: Electrical Equipment (Safety) Regulations 2016 (retrieved October 2026)
  2. Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved October 2026)
  3. HSE EIS21: Ultrasonic cleaning (retrieved October 2026)
  4. HSE: COSHH and cleaning (retrieved October 2026)
  5. National Association of Jewellers: Caring for jewellery (retrieved October 2026)
  6. DK Sonic UK: 10 litre digital ultrasonic cleaner (retrieved October 2026)
  7. Durston: Ultrasonic cleaner instructions (retrieved October 2026)
  8. VEVOR UK: 10L digital ultrasonic cleaner (retrieved October 2026)