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Ultrasonic Cleaners for Jewellers: The Complete Warburtons Buying & Care Guide

Date: 16-07-2026
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Ultrasonic Cleaners for Jewellers: The Complete Warburtons Buying & Care Guide

If you work with jewellery — whether you're polishing a customer's engagement ring, prepping stock for a display cabinet, or finishing a piece fresh off the bench — a good ultrasonic cleaner is one of the hardest-working tools in the workshop. It's fast, it's gentle on most metals and gemstones, and it gets into places a cloth or brush simply can't reach.

At G&A Warburtons, we stock one of the widest ranges of ultrasonic jewellery cleaners and accessories in New Zealand, from compact personal units through to full workshop-grade Elma machines. Here's everything you need to know before you buy — and where to find the right model in our Ultrasonics & Accessories range.

How Does an Ultrasonic Cleaner Actually Work?

An ultrasonic cleaner uses high-frequency sound waves (typically around 37 kHz) to agitate a cleaning solution. This creates millions of microscopic bubbles in a process called cavitation. When those bubbles collapse, they release a tiny burst of energy that lifts dirt, polishing compound, oils and grime out of tiny crevices, claw settings and chain links — without any scrubbing or abrasive contact.

This is exactly why ultrasonic cleaning has become the industry standard for jewellers: it's thorough, it's quick (often just 3–5 minutes per clean), and it's far less likely to scratch or damage a finish than manual polishing.

Is Ultrasonic Cleaning Safe for All Jewellery?

Mostly, yes — but not always. Ultrasonic cleaners are excellent for solid metal pieces such as sterling silver, gold and gold-filled chains, and for most set gemstones like diamonds, sapphires and amethyst.

However, caution is needed with:

  • Soft or porous stones – pearls, opals, turquoise and emeralds can crack, cloud or dislodge under vibration
  • Treated or fracture-filled stones – always check treatment history before cleaning
  • Antique or fragile settings – older claws and prongs may not withstand vibration well

When in doubt, a gentler ionic or steam cleaning method may be more appropriate — our team can advise on the best method for a specific piece.

Choosing the Right Ultrasonic Cleaner for Your Business

The right unit really comes down to volume and use case:

For personal or retail counter use: If you just need to freshen up a customer's ring while they wait, or you want a simple in-store cleaning option, the Ultrasonic - Personal Sonic Wave 600ml is a compact, easy on/off unit that's perfect for light, everyday use — and doubles as a lovely retail add-on for customers who want to keep their own jewellery sparkling at home.

For small studios and hobbyists: The Elma Ultrasonic EASY 20H – 1.75L is a great entry point into professional-grade cleaning. It features 37 kHz high-performance transducers, a stainless steel cavitation-resistant tank, adjustable heat from 30–80°C, and both continuous and timed (up to 30 minute) operation.

For busy workshops: Step up to the Elma Ultrasonic - EASY 30H – 2.75L. It shares the same reliable Elma engineering — sweep function for even sound distribution, Pulse mode for stubborn polishing compound, and safety shutoffs — but with a larger tank to handle higher volumes or bulkier pieces without sacrificing cleaning consistency.

Both Elma units are made in Germany and backed by a 2-year warranty, so you're investing in a machine built to handle daily commercial use.

Don't Forget the Accessories

An ultrasonic cleaner is only half the setup. A few accessories make a real difference to results and workflow:

  • A basket to keep jewellery suspended and away from the tank base
  • A proper ultrasonic cleaning solution, such as Ultrasonic Cleaning Solution - Ferrodet 1ltr, rather than plain water, to lift oils and tarnish effectively
  • Tweezers or calipers for safely handling hot or wet pieces
  • A soft brush for a final gentle brush-out of settings after the ultrasonic cycle

Ultrasonic Cleaner Maintenance Tips

  • Replace your cleaning solution regularly — once it looks murky, it's lost most of its effectiveness
  • Never run the unit dry; always fill to the marked fill line before switching on
  • Let the machine heat the water itself rather than pouring in hot water, which can damage internal components
  • Give the tank a wipe-out between different types of jobs to avoid cross-contamination of polishing compounds

Frequently Asked Questions

How long should I run an ultrasonic cleaner for jewellery? Most pieces only need 3–5 minutes. Delicate items should use shorter cycles.

What's the best frequency for jewellery cleaning? 35–45 kHz suits most jewellery; higher frequencies are gentler and better suited to delicate gems.

How often should display or workshop pieces be cleaned? Retail display jewellery benefits from a weekly clean to keep it looking its best. Personal or workshop pieces are usually fine with a monthly clean, or after heavy polishing work.

Can I use tap water instead of cleaning solution? You can, but a dedicated solution will noticeably improve results, especially for tarnish and polishing residue.

Shop Ultrasonic Cleaners at Warburtons

Whether you're outfitting a full workshop or just need a reliable countertop unit, browse our complete range in Ultrasonics & Accessories. With over 65 years of experience supplying New Zealand jewellers from our Auckland showroom and warehouse, G&A Warburtons makes it easy to get the right cleaning setup for your business.

Have questions about which model suits your workload? Get in touch with our team — we're happy to help you find the right fit.

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