Opal Jewellery: Why It Needs Special Care
Opal jewellery care comes down to one fact most people do not know when they buy their first piece: opal holds water inside it, and that makes it more fragile than almost any other popular gemstone. Treat it like a diamond and you will eventually crack it. At Vanhess Jewellery in Coquitlam, BC, opal repairs are some of the saddest jobs that cross the bench, because most of the damage we see was avoidable. Here is how to care for opals so yours stays whole.
Why opal is so much softer than it looks
Opal sits at roughly 5 to 6.5 on the Mohs hardness scale, according to GIA. That is soft. A diamond is 10, sapphire is 9, and ordinary household dust is around 7, which means everyday grit can scratch an opal just by rubbing against it. The October birthstone needs gentler handling than the stones most people are used to.
It is not just hardness, though. Opal contains water, and that water is the catch.
The real danger: crazing from drying out
Because opal holds water, it can lose moisture in dry air or under heat, and when it does it can crack or develop a network of fine fractures called crazing. GIA notes that opals can craze when exposed to heat, including the heat from intense light, and that very dry storage pulls moisture out of them. A safe or vault is one of the worst places to keep an opal long term, precisely because the air inside is so dry.
Crazing is heartbreaking because it usually cannot be reversed. Once that web of cracks appears, the stone's value and beauty are gone. This is why I tell every opal customer the same thing: the goal is not to clean it perfectly, the goal is to never let it dry out or overheat.
What will damage an opal
Keep your opal away from a few specific things. Ultrasonic and steam cleaners are top of the list. The vibration and heat can crack opal or damage the glue in assembled stones, so GIA warns against them. Sudden temperature swings, hairspray and perfume, household chemicals, and long stretches in bone-dry storage all work against the stone too. Wearing an opal ring while cleaning the house or doing the dishes invites both chemicals and knocks.
Doublets and triplets need extra caution
Not every opal is solid. Doublets are a thin slice of opal glued to a dark backing; triplets add a clear quartz or glass cap on top to protect and magnify the colour. They are a legitimate, more affordable way to enjoy opal's play-of-colour. The catch is the glue. GIA notes that prolonged exposure to water can weaken the adhesive in doublets and triplets, so these should never be soaked or submerged. If you are not sure whether your opal is solid or assembled, ask, because it changes how you clean it.
| Do | Avoid |
|---|---|
| Clean gently with warm, soapy water and a soft cloth | Ultrasonic and steam cleaners |
| Store in a soft pouch at normal room humidity | Long-term storage in a dry safe or vault |
| Put jewellery on last, after hairspray and perfume | Chemicals, perfume, and hairspray contact |
| Take rings off for cleaning, gardening, and sport | Sudden heat or temperature swings |
| Ask whether your opal is solid or a doublet/triplet | Soaking doublets or triplets in water |
Settings that protect a soft stone
How an opal is set matters as much as how you clean it. Because the stone is soft and can chip, a protective setting goes a long way. A bezel, where a rim of metal wraps the edge of the stone, shields the vulnerable girdle far better than high prongs that leave it exposed. For a ring you plan to wear daily, a bezel or a low-profile setting is worth asking for. Pendants and earrings are gentler lives for opal than rings, simply because they take fewer knocks; a ring on your dominant hand meets doorframes, countertops, and steering wheels every day. If you love opal but live an active life, consider wearing it as a pendant and saving the ring slot for something harder like sapphire.
How to actually clean it
Keep it simple. GIA's recommended method for opal is warm, soapy water and a soft cloth or soft brush, then a gentle pat dry. That is it. No solvents, no ultrasonic, no soaking for solid stones and absolutely no soaking for doublets or triplets. If your opal looks dull, it is far more likely surface grime or skin oils than anything you need a harsh cleaner for. When in doubt, bring it to us and we will clean it properly without risking the stone. One habit that saves a lot of opals: put your jewellery on last when you get ready, after hairspray, perfume, and lotion have dried, and take rings off before washing up or working with your hands. Most of the chips and chemical hazing we see come from an opal worn through tasks it was never built for, not from a single dramatic accident.
Key Takeaways
- Opal is soft, around 5 to 6.5 on the Mohs scale, so everyday grit can scratch it.
- Opal holds water; heat and very dry air can cause permanent cracking called crazing.
- Never use ultrasonic or steam cleaners on opal; clean with warm, soapy water and a soft cloth.
- Doublets and triplets are glued, so never soak them; prolonged water can weaken the adhesive.
- Opal is an October birthstone and needs gentler handling than harder stones like sapphire or diamond.
Frequently Asked Questions
How do I clean opal jewellery safely?
Use warm, soapy water and a soft cloth or soft brush, then pat dry. That is GIA's recommended method. Avoid ultrasonic cleaners, steam, solvents, and harsh chemicals. For solid opals a quick gentle wash is fine; never soak a doublet or triplet, because water can weaken the glue.
Why do opals crack or craze?
Opal contains water. When it loses moisture in dry air or is exposed to heat, including heat from intense light, it can develop a network of fine cracks called crazing. This damage is usually permanent, which is why opals should not be stored in very dry places like a safe.
Can I put opal in an ultrasonic cleaner?
No. The vibration and heat of an ultrasonic or steam cleaner can crack opal and can damage the adhesive in doublets and triplets. GIA advises against both. Stick to warm, soapy water and a soft cloth instead.
How should I store opal jewellery?
Store opal in a soft pouch at normal room humidity, away from heat and direct sunlight. Avoid long-term storage in a dry safe or vault, since the low humidity can pull moisture from the stone over time and lead to crazing.
Sources
- GIA — Opal Care and Cleaning Guide, accessed June 2026
- GIA — October Birthstones, accessed June 2026
- Geology.com — Mohs Hardness Scale, accessed June 2026
Data sourced June 2026. If you spot something out of date, let us know and we will update the guide.
Visit Vanhess
We are a family-run studio at 2929 Barnet Highway, Unit 2424, in Coquitlam, with an on-site goldsmith. If your opal has loosened in its setting or you want it cleaned without risking the stone, bring it in and we will handle it the gentle way. Learn more about our jewellery repair service, browse pendants for setting ideas, or call +1 (604) 653-6449.
