Aquamarine
Aquamarine is the pale sea-blue member of the beryl family and the March birthstone. Here is how it holds up in a ring you actually wear, what to look for in colour, and how to keep it clean.
Key Takeaways
- Aquamarine is a blue-to-greenish-blue variety of the mineral beryl, the same family as emerald and morganite, and it is the birthstone for March (GIA).
- It sits at 7.5 to 8 on the Mohs hardness scale, hard enough to shrug off everyday dust and resist scratching, which makes it a sensible choice for a ring you wear daily (International Gem Society).
- Its toughness is only rated "good," and it has imperfect cleavage with brittle tenacity — meaning a hard knock on a corner or edge can chip or split it. A protective setting matters.
- Colour is where the money goes: a clean, more saturated blue is rarer and pricier than the very pale, washed-out blue you see in inexpensive pieces.
- Clean it with warm soapy water and a soft brush. Skip steam, and treat ultrasonic cleaners with caution, especially on stones with visible inclusions.
Is aquamarine durable enough for an everyday ring?
Yes, with one honest caveat about how you treat it. Aquamarine scores 7.5 to 8 on the Mohs scale, which the International Gem Society notes is hard enough that ordinary household dust (around Mohs 7) cannot scratch it. That puts it well above softer coloured stones and makes it a reasonable everyday stone — including for engagement rings, as long as you go in with clear eyes.
The catch is the difference between hardness (resistance to scratching) and toughness (resistance to chipping and breaking). Aquamarine's toughness is rated "good," not excellent. It has imperfect cleavage and what gemmologists call brittle tenacity, so a sharp blow against a cabinet or a car door — the kind of knock a ring takes more often than people expect — can chip an exposed corner or, on rare occasion, split the stone along a cleavage plane. It is tougher than its cousin emerald, but not in the same league as sapphire or a diamond.
On our bench in Coquitlam, the practical answer is the setting. We steer aquamarine ring buyers toward bezels or low-profile settings with the girdle protected, rather than a tall, exposed solitaire that leaves the edges hanging out. Do that, and an aquamarine ring will give you years of daily wear without drama.
How aquamarine compares to other coloured stones
If you are weighing aquamarine against the harder coloured stones, this is the short version. For the full picture across every stone, see our Gemstone Guide: Durability, Colour & Care, Stone by Stone.
| Stone | Mohs hardness | Toughness | Everyday-ring verdict |
|---|---|---|---|
| Aquamarine (beryl) | 7.5–8 | Good | Fine with a protective setting |
| Sapphire | 9 | Excellent | Excellent for daily wear |
| Ruby | 9 | Excellent | Excellent for daily wear |
| Emerald | 7.5–8 | Poor–fair | Wear with real care |
Aquamarine and emerald sit at the same hardness, but aquamarine is the more wearable of the two because it is typically cleaner inside and therefore tougher. Sapphire and ruby (both corundum, Mohs 9) are the durable workhorses if you want a coloured stone you never have to think about.
Colour and value: what to actually look for
Aquamarine ranges from a barely-there pale blue to a deeper, more vivid sky-to-sea blue, sometimes with a faint green cast. The GIA describes the gem within a greenish-blue to blue colour range. Here is the part that drives price: the paler, washed-out blues are common and inexpensive, while a clean stone with stronger, more even saturation is rarer and costs more. The very faint stones can look almost colourless in anything but bright light.
A few things we look at when grading colour on the bench:
- Saturation over hue. A medium, saturated blue reads as "aquamarine" across the room. A pale stone reads as "is that even blue?" Saturation is what you are paying for.
- Clarity. Most gem aquamarine is eye-clean, with no visible inclusions. That cleanliness is normal for the stone, so a piece with obvious inclusions should be priced accordingly.
- Size shows colour. Because the colour is naturally light, larger aquamarines display it better — a small pale stone can look nearly white, while the same colour in a bigger stone looks properly blue.
Note that most aquamarine on the market is heat-treated to push out greenish or yellow tones and settle it into a pure blue. This is a standard, stable, accepted treatment — not a flaw — but you should expect it and it should be disclosed.
March birthstone and when aquamarine makes sense
Aquamarine is the birthstone for March and the traditional gift for a 19th wedding anniversary (GIA). Beyond the calendar, it is a strong pick when someone wants a cool, light, summery blue without the price of a fine sapphire, and it photographs beautifully in daylight. If you are shopping for a coloured engagement stone generally and want to weigh the trade-offs, our guide to Beyond Diamonds: Alternative Stones walks through the durable options and where aquamarine fits.
How to care for an aquamarine ring
Easy stone to live with. Clean it at home with warm water, a drop of mild dish soap, and a soft brush, then rinse and dry — that handles the lotion and skin oil that dull the surface and is the cleaning method GIA recommends as safe for aquamarine. A few habits keep it looking right:
- Skip steam cleaning, and be cautious with ultrasonic cleaners — the vibration can be risky around any inclusions or fractures in the stone.
- Keep aquamarine out of prolonged strong heat and direct sunlight over long periods, which can fade the colour.
- Take the ring off for the gym, gardening, lifting, and rough chores. Most chips happen from impact, not from wear.
- Store it separately in a pouch or a lined box so harder stones (diamond, sapphire) don't scratch it.
If an aquamarine does take a knock and chips a corner, it is usually re-cuttable or resettable. Our on-site goldsmith handles that kind of repair in-house, so a damaged stone rarely means a lost ring.
Frequently Asked Questions
Is aquamarine hard enough for an engagement ring?
Yes. At Mohs 7.5–8 it resists everyday scratching well, and the International Gem Society lists it as a good choice for daily-wear rings. The thing to manage is impact: choose a setting that protects the stone's edges, like a bezel, and you'll be fine.
Can aquamarine chip or crack?
It can. Aquamarine has imperfect cleavage and brittle tenacity, so a hard blow on a corner can chip it or, rarely, split it. It is tougher than emerald but less tough than sapphire. A protected setting and taking the ring off for rough work prevent almost all of this.
Why are some aquamarines so much cheaper?
Colour. Pale, washed-out blue aquamarine is common and inexpensive, while a clean stone with stronger, more even saturation is rarer and costs more. Larger stones also show the colour better, since aquamarine's natural blue is light to begin with.
Can I clean my aquamarine ring at home?
Yes — warm water, mild dish soap, and a soft brush, which is the method GIA notes is safe for the stone. Avoid steam, be cautious with ultrasonic cleaners, and keep it out of long stretches of strong heat or sunlight that can fade the colour.
Is aquamarine treated?
Usually, yes. Most aquamarine is heat-treated to remove greenish or yellow tones and bring out a pure blue. This is a standard, stable, widely accepted treatment that should be disclosed at purchase — it is not a defect and does not need any special care.
What month is aquamarine the birthstone for?
March. Aquamarine is the March birthstone and is also the traditional gift for a 19th wedding anniversary, according to GIA.