Opal
Opal is beautiful but delicate. Here's an honest look at whether you can wear it every day, why it cracks, and how to set and care for it so the play-of-colour lasts.
Key Takeaways
- Opal sits at roughly 5–6.5 on the Mohs hardness scale, which is soft for a stone you wear on your hand. GIA and Jewelers of America both place it in this range.
- It is not ideal for a daily-wear ring. Opal scratches, chips, and can crack from knocks or sudden temperature changes.
- Opal is hydrated silica — it holds water inside it — so heat, dry air, and harsh cleaning can dry it out and cause fine cracks called crazing.
- It is the October birthstone and is prized for its play-of-colour, the shifting flashes of red, green, and blue across the surface.
- Opal is happiest as earrings, pendants, and brooches — pieces that don't take the daily beating a ring does.
Can you wear opal every day?
Honestly, we'd steer you away from an opal you'd wear on your hand every single day. Opal is a soft, water-sensitive stone, and a ring lives a hard life — it bangs into door frames, gets caught in pockets, and meets hand soap, lotion, and dishwater all day long. None of that is kind to opal. As a daily ring stone it will show wear far faster than the tougher choices in our Gemstone Guide: Durability, Colour & Care, Stone by Stone.
That doesn't mean you can't own and love opal. It means you set it smart and wear it in the right pieces. An opal pendant or pair of earrings can last a lifetime with very little fuss, because it never takes the knocks a ring does. If you have your heart set on an opal ring, wear it as an occasional or dress ring, not the one you garden, wash dishes, and type in.
Why opal is so delicate
Opal is hydrated silica — chemically it's silica with water locked inside its structure, and that water can make up a meaningful share of the stone (GIA). That water content is the heart of both its beauty and its fragility.
Softness
At about 5 to 6.5 on the Mohs hardness scale, opal is softer than the quartz dust floating in ordinary household air. That means everyday grit can dull and scratch its surface over time. By comparison, a sapphire or a ruby sits at 9 and shrugs off the same grit.
Crazing
Because opal holds water, it hates drying out and it hates sudden temperature swings. When the stone loses moisture or gets shocked by heat, a fine network of surface cracks can appear. Jewellers call this crazing, and once it happens it can't be reversed. Jewelers of America flags heat, chemicals, and "temperature and air pressure changes" as the things to keep opal away from (Jewelers of America).
Water and chemicals
This is the surprising one. People assume a "water stone" likes water, but standing water, soaps, perfumes, and cleaning chemicals can dull opal, and on some types they can seep in and cause clouding. Doublets and triplets — opal layered onto a backing or under a cap — are especially at risk, because moisture can get into the glue and lift the layers apart.
How opal compares to tougher coloured stones
If you want a coloured stone for an everyday ring, the table below shows why we usually point people toward the harder options. For more alternatives, see Beyond Diamonds: Alternative Stones.
| Stone | Mohs hardness | Daily ring? |
|---|---|---|
| Opal | 5–6.5 | Not recommended |
| Emerald | 7.5–8 | With care |
| Ruby | 9 | Yes |
| Sapphire | 9 | Yes |
Hardness figures from GIA and Jewelers of America. Emerald is hard but brittle, so it earns a "with care" rather than a flat yes.
The right way to set and wear opal
On our bench in Coquitlam, the goldsmith's first move with opal is to protect the stone. A few things make a real difference:
- Choose earrings, pendants, or brooches first. These sit away from knocks and water, so the stone keeps its colour and stays intact for decades.
- If it must be a ring, use a protective setting. A bezel — a rim of metal wrapped around the stone's edge — guards the vulnerable girdle far better than tall, exposed prongs. A lower profile also helps it dodge knocks.
- Keep it as a dress ring. Slip it off before washing up, cleaning, gardening, swimming, or any rough work. That single habit prevents most opal damage we see come across the bench.
- Pick a solid opal over a doublet or triplet if you want the longest life and the least worry about layers separating.
How to care for opal
Opal care is simple once you know the rules. Clean it gently with warm, mildly soapy water and a soft cloth or soft brush, then dry it. Never put opal in an ultrasonic cleaner or steamer — both the vibration and the heat can crack it (GIA, Jewelers of America).
Keep it away from heat sources and big temperature swings — don't leave it on a sunny windowsill or in a hot car. Store it on its own in a soft pouch or a lined box, away from harder stones that would scratch it (GIA). And put it on last when you're getting ready, after perfume, hairspray, and lotion, so those products don't settle on the stone.
If you've inherited an opal piece or you're not sure how a setting is holding up, bring it in. We can check the stone and setting on-site and tell you honestly whether it's safe to wear as is.
Frequently Asked Questions
Can you wear an opal ring every day?
We don't recommend it. At Mohs 5–6.5 opal is soft, and it's sensitive to water, chemicals, and temperature changes. A ring takes constant knocks and exposure, so an everyday opal ring will scratch, dull, or even crack far sooner than a harder stone. Wear opal as a dress ring, or better yet as earrings or a pendant.
Why does opal crack or get a cloudy network of lines?
That's crazing — a fine web of surface cracks. Opal holds water inside it, so when it dries out or hits a sudden temperature change, the stone can craze. It's not reversible, which is why you keep opal away from heat, dry air, and ultrasonic or steam cleaning.
Is opal safe to get wet?
A quick gentle clean in mild soapy water is fine. Prolonged soaking, swimming, dishwater, and chemical exposure are not — they can dull the stone, and on doublets and triplets water can seep into the glue and separate the layers. Take opal off before water-heavy tasks.
What is the best setting for an opal ring?
A bezel setting, where a rim of metal wraps the stone's edge, gives the most protection. Pair it with a low profile so the stone sits out of harm's way. Tall, exposed prong settings leave the soft stone vulnerable to chips.
What month is opal the birthstone for?
Opal is one of the October birthstones, alongside tourmaline, according to the GIA. It's prized for its play-of-colour — the shifting flashes of colour across the surface.
How should I store opal jewellery?
On its own, in a soft pouch or lined box, away from harder stones that would scratch it and away from heat or very dry air. Don't leave it baking in a hot car or on a sunny sill.