Can You Use an Ultrasonic Cleaner on Moissanite? The Complete Guide

Ultrasonic cleaners have become increasingly popular for home jewelry care — they are fast, effective, and produce results that rival professional cleaning. But not every gemstone is safe in an ultrasonic cleaner, and knowing which stones are safe and which are not is essential before you drop your ring into one. The good news for moissanite owners: moissanite is one of the safest gemstones for ultrasonic cleaning. Here is everything you need to know.

How Ultrasonic Cleaners Work

An ultrasonic cleaner uses high-frequency sound waves (typically 20,000–40,000 Hz) transmitted through a liquid solution to create millions of tiny bubbles in a process called cavitation. These bubbles implode on contact with surfaces, creating microscopic scrubbing action that removes dirt, oils, and buildup from every surface of the jewelry — including the areas behind the stone that a toothbrush cannot reach. The process is gentle enough not to scratch metal or stone surfaces, but powerful enough to remove the most stubborn buildup.

Is Moissanite Safe in an Ultrasonic Cleaner?

Yes — moissanite is safe for ultrasonic cleaning. Here is why:

• Hardness (9.25 Mohs): Moissanite is hard enough that the cavitation process cannot scratch or damage its surface.
• No cleavage: Unlike diamond (which has perfect cleavage) and many colored gemstones, moissanite has no cleavage planes. This means the ultrasonic vibrations cannot cause the stone to split along internal planes — a risk that makes ultrasonic cleaning dangerous for stones like emerald, opal, and tanzanite.
• Chemical inertness: Moissanite does not react with the cleaning solutions used in ultrasonic cleaners.
• Thermal stability: Moissanite is stable at the temperatures generated by ultrasonic cleaners, which typically operate at or near room temperature.

The result: moissanite comes out of an ultrasonic cleaner looking extraordinary — the cavitation process removes the buildup behind the stone that causes the most brilliance loss, restoring the stone's full fire and light performance.

What About the Metal Setting?

The stone is safe. The metal setting requires more consideration:

Solid Gold (14K, 18K): Safe

Solid gold handles ultrasonic cleaning well. The cavitation process does not damage solid gold and effectively removes buildup from the metal surface and from around the prongs.

Platinum: Safe

Platinum is safe for ultrasonic cleaning. Like solid gold, it handles the process well and benefits from the thorough cleaning.

Rhodium-Plated Settings: Use With Caution

Rhodium plating is more vulnerable to ultrasonic cleaning than solid metals. Repeated ultrasonic cleaning can accelerate plating wear, particularly at high-contact points. For rhodium-plated white gold or silver settings, limit ultrasonic cleaning to occasional use — once a month at most — and rely on the warm water and soap method for weekly cleaning. Read our metal comparison guide for the full durability picture.

Rings With Fracture-Filled or Treated Stones: Do Not Use

If your ring has accent stones that are not moissanite — particularly emeralds, opals, pearls, or any fracture-filled stones — do not use an ultrasonic cleaner. These stones can be damaged or destroyed by the cavitation process. Moissanite-only rings are safe; mixed-stone rings require more caution.

How to Use an Ultrasonic Cleaner on Your Moissanite Ring

Step 1: Choose the Right Solution

Use a jewelry-specific ultrasonic cleaning solution or a simple mixture of warm water and a few drops of mild dish soap. Avoid ammonia-based solutions for plated settings. Avoid harsh chemicals that could damage the metal finish.

Step 2: Check the Ring First

Before placing your ring in the ultrasonic cleaner, inspect the prongs. If any prong is loose, bent, or worn, do not use the ultrasonic cleaner — the vibrations can worsen a loose prong and increase the risk of stone loss. Have the prongs repaired first. Read our article on loose stones for the inspection protocol.

Step 3: Run the Cycle

Place the ring in the cleaner basket, ensuring it does not touch other pieces of jewelry (metal-on-metal contact during ultrasonic cleaning can cause scratching). Run a standard cycle — typically 3–5 minutes for most home ultrasonic cleaners.

Step 4: Rinse and Dry

Remove the ring from the cleaner, rinse thoroughly under warm running water to remove any cleaning solution residue, and dry with a soft, lint-free cloth. Do not use paper towels — they can leave micro-scratches on polished metal surfaces.

Step 5: Inspect the Result

After cleaning, hold the ring up to good light and inspect the stone. You should see a dramatic improvement in brilliance — the buildup behind the stone that was blocking light is gone, and the stone's full fire and light performance is restored. Also inspect the prongs to confirm they are still secure after the cleaning process.

How Often Should You Use an Ultrasonic Cleaner?

For most moissanite owners, a monthly ultrasonic cleaning combined with a weekly warm water and soap cleaning produces the best results. The weekly cleaning removes surface buildup before it hardens; the monthly ultrasonic cleaning removes the deeper buildup that accumulates behind the stone and in the setting details. Read our weekly cleaning ritual for the complete routine.

Home Ultrasonic Cleaners: What to Buy

Home ultrasonic cleaners range from $30 to $150 and are widely available online and at jewelry supply stores. For most moissanite owners, a mid-range model in the $50–80 range is more than adequate. Look for a model with a removable basket, a timer, and a heating function — warm solution is more effective than cold for removing oils and buildup.

The Bottom Line

Moissanite is one of the best gemstones for ultrasonic cleaning — its hardness, lack of cleavage, and chemical inertness make it completely safe for the process. A monthly ultrasonic cleaning, combined with a weekly warm water and soap routine, keeps your moissanite performing at its absolute best. The result is a stone that looks as brilliant after years of daily wear as it did on the day you first put it on.

For the complete care framework, read our Moissanite Care Guide and our article on Professional vs. At-Home Cleaning.