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How you should clean and store a gemstone ring depends almost entirely on where the specific stone falls on the Mohs hardness scale — a 1-to-10 measure of scratch resistance, with diamond at the top. Harder stones tolerate more aggressive cleaning; softer, more porous, or organic stones need consistently gentle handling. Treating every gemstone the same way is one of the most common causes of avoidable damage, since a method that's perfectly safe for one stone can genuinely harm another.
This guide breaks stones into three practical care tiers, covers the habits that apply across all of them, and explains why treatment history matters as much as raw hardness.
The Mohs Hardness Scale, Briefly
Every mineral has a hardness rating from 1 (softest) to 10 (hardest, diamond), measuring resistance to scratching. This single number is the most useful starting point for knowing how a stone should be cleaned and stored, though it isn't the whole story — a hard stone with natural inclusions or chemical treatment can still be more fragile than its hardness number alone suggests.
Tier 1: The Hardest Stones (Roughly 9–10 on the Mohs Scale)
Diamond, sapphire, ruby
These stones are dense and scratch-resistant enough to tolerate a full soak, gentle scrubbing with a soft-bristled brush, and in most cases an ultrasonic cleaner — provided the stone is untreated and the setting is secure. The real exception to watch for in this tier isn't hardness, it's treatment history: a treated stone in this hardness range may still need gentler handling than the raw Mohs number implies.
Tier 2: Hard, But Not Bulletproof (Roughly 7–8 on the Mohs Scale)
Amethyst, citrine, garnet, and other quartz-family stones
These hold up well to normal daily wear and scratch less easily than softer stones, but none of them belong in an ultrasonic or steam cleaner. Warm water, a drop of mild soap, and a soft brush is the right approach across this entire tier — the main thing that differs stone to stone within this range is what each one should be kept away from (heat, certain chemicals, prolonged sun exposure) rather than the cleaning method itself.
Tier 3: Soft, Porous, or Organic Stones (Below 7, Often Treated)
Opal, emerald, turquoise, pearl, amber
This tier needs the most careful handling, for several different reasons depending on the specific stone:
- Opal is soft and highly porous, sensitive to water, chemicals, and sudden temperature changes, and can crack or dehydrate with improper care — clean with a damp microfiber cloth only, never soak, and store in a cool, stable environment
- Emerald is often more fragile than its hardness rating suggests due to natural inclusions, and is commonly oil-treated to enhance clarity — harsh cleaning can strip that treatment, so gentle soap and a soft brush only, no soaking
- Turquoise is porous and can absorb liquids and oils, making it vulnerable to discolouration and damage from anything beyond a gentle wipe
- Pearls, at roughly 2.5 to 4.5 on the Mohs scale, are among the softest materials in jewellery at all, and organic rather than mineral — never soak, never use chemical cleaners, and put them on last, after perfume and skincare, not before
- Amber is porous and can be damaged by heat and chemical exposure, similar to emerald in terms of care sensitivity
Nothing in this tier should be soaked, exposed to ultrasonic or steam cleaning, or handled with anything beyond a soft cloth and, where appropriate, the gentlest possible soap-and-water approach.
Universal Habits That Apply Across Every Tier
Regardless of which stone you're dealing with, a few habits reduce risk across the board:
Remove the ring during household chores, cooking, or gardening — chemical exposure and impact risk are the same regardless of stone hardness
Limit water contact generally — brief hand-washing is fine for most stones, but prolonged soaking, swimming, and hot tubs are best avoided, particularly given chlorine and saltwater's effect on both stones and any gold-plated setting; we cover the plating side of this in our guide on wearing gold-plated jewellery in the pool or sea
Apply lotions, perfume, and hairspray before putting the ring on, not after
Store stones separately by hardness — harder stones can scratch softer ones if kept together in the same compartment
Watch for sudden temperature changes, which can fracture sensitive stones like opal, even when the stone hasn't been mishandled in any other way
Default to gentle cleaning — mild soap, lukewarm water, and a soft cloth or brush is the safest starting point for any stone you're unsure about
Why Treatment History Matters as Much as Hardness
A stone's Mohs rating tells you about scratch resistance, not necessarily its overall fragility. Many gemstones — emeralds in particular, but also many others — are commonly treated (oiled, fracture-filled, heat-treated) to enhance clarity or colour, and these treatments can be undone or damaged by cleaning methods that would otherwise be perfectly safe for an untreated stone of the same hardness. If you're not sure whether a specific stone has been treated, defaulting to the gentlest care approach in this guide is the safer choice.
What This Means for Natural, Semi-Precious Ring Stones
Fashion and artisan jewellery, including hand-set pieces like our Stone Age collection, commonly uses softer and more porous stone varieties than fine jewellery's typical diamond-sapphire-ruby range. If you're not certain which tier a specific stone falls into, treating it with Tier 3 care — gentle wiping only, no soaking, no chemicals, careful temperature handling — is the safer default than assuming it can tolerate more aggressive cleaning. For general handmade ring care beyond the stone itself, see our guide on how to care for handmade rings.
FAQs
How do I know how to clean my specific gemstone ring?
Check where the stone falls on the Mohs hardness scale as a starting point, and consider whether it's likely to be treated — harder, untreated stones tolerate more aggressive cleaning, while softer, porous, or treated stones need consistently gentle handling.
Can I use an ultrasonic cleaner on a gemstone ring?
Only for the hardest, untreated stones like diamond, sapphire, or ruby with a secure setting. Softer or treated stones, and stones with visible inclusions, should never go in an ultrasonic cleaner.
Which gemstones need the most careful handling?
Opal, emerald, turquoise, pearl, and amber are among the most sensitive — all are soft, porous, organic, or commonly treated, and none should be soaked or exposed to chemical cleaners.
Why do treated gemstones need gentler care than their hardness suggests? Treatments like oiling or fracture-filling can be damaged or stripped by cleaning methods that would otherwise be safe for the stone's raw hardness rating, which is why treatment history matters alongside the Mohs number.
Is it safe to wear gemstone rings in water?
Brief contact, like hand-washing, is generally fine for most stones, but prolonged soaking, swimming, and hot tubs should be avoided, particularly for porous or softer stones.
How should I store multiple gemstone rings together?
Separate them by hardness where possible — harder stones can scratch softer ones if stored in direct contact, so individual compartments or pouches are the safer choice.
Explore hand-set natural stone pieces in our Stone Age and Handmade Rings collections at Mine of Design.
