Ultrasonic vs. Spray vs. Cloth: Which Jewelry Cleaner Should You Actually Use?

By Manolo Sanchez, founder of Sparklean. We have made jewelry-care products in Florida since 2003, and they sit on jewelers' counters in more than 50 retail locations across the USA, Mexico, Costa Rica and Spain. We sell an ultrasonic machine, a spray, a brush, a pen, a cloth and a cream — so unlike most guides, we have no reason to push you toward one method. Here is what we actually tell customers.

The short answer

Match the cleaner to the piece, not the other way around:

• Luxury watches (Rolex, Omega, Cartier): never submerge the watch head. Clean the bracelet and case with a soft-bristle brush and an ammonia-free solution.
• Diamond rings with untreated stones: an ultrasonic cleaner gives the deepest clean under prongs; a fine-tip cleaning pen keeps them bright between deep cleans.
• Pearls, opals, emeralds and treated stones: never put them in an ultrasonic. Spray-and-wipe only, with a pH-balanced, ammonia-free spray.
• Tarnished silver, brass and copper: tarnish is a chemical layer, so it needs chemistry, not vibration — a treated polishing cloth for light tarnish, a polishing cream for heavy buildup.
• Eyeglasses and coated lenses: ammonia-free spray only. Ammonia and alcohol strip anti-reflective coatings over time.

Side-by-side comparison

Why we tell Rolex owners to skip the ultrasonic

This surprises people, because we sell a $170 ultrasonic machine. We would still rather you not put your Submariner in it. Ultrasonic cavitation stresses gaskets and seals, and on older watches it can drive moisture exactly where you do not want it. The grime you actually see on a watch lives in the bracelet links — and a soft-bristle brush with ammonia-free solution dissolves it in two or three minutes with the watch head never touching liquid. That is the routine we have watched jewelers use across our retail counters for two decades.

When the ultrasonic IS the right call

For untreated diamond studs, solid gold chains and stainless bracelets (removed from the watch head), 40 kHz cavitation reaches under prongs and inside links where no cloth can. Two rules first: check that no stone is loose, and confirm the stone is untreated — fracture-filled and heavily treated stones can be damaged by ultrasonic cleaning. If you are not sure whether a stone is treated, use the spray instead.

The 30-second habit that beats every deep clean

Most dullness is not dirt — it is body oil, lotion and sunscreen filming over the stone. A quick pass with the pen or a spray-and-wipe after wear keeps pieces bright enough that deep cleans become rare. It is the single habit we recommend most.

FAQ

Can an ultrasonic cleaner crack a diamond?

An untreated diamond itself is extremely unlikely to be damaged. The real risks are treated or fracture-filled stones, and prongs that were already loose — the vibration finishes what wear started. Inspect settings before every ultrasonic cycle.

How often should I clean my jewelry?

Pieces worn daily: a 30-second clean weekly and a deep clean monthly. Pieces worn occasionally: clean before storage, not after it.

Is ammonia OK for gold and diamonds?

Bare solid gold and untreated diamonds tolerate it. Pearls, treated stones, plated finishes and lens coatings do not — we wrote a full explanation in Is ammonia bad for your jewelry?

Do you ship to Europe?

Yes — we ship across the EU and to Spain with localized pricing, and our products are also stocked in our three Barcelona locations.

Every Sparklean formula is biodegradable, ammonia-free and pH-balanced, made in the USA since 2003, and covered by a 30-day satisfaction guarantee. Questions about a specific piece? Ask us — telling people NOT to buy the wrong product is how we have kept a 4.89-star average across 381 verified reviews.