Aquamarine Color Chart Explained: The Spectrum of Sea-Blue Beauty
Aquamarine is not one color but a family of blues and blue-greens, from nearly colorless ice-blue to deep, saturated blue. Buying it well means knowing what creates the color, how the trade describes it, which treatments are routine, and which “too good to be true” blues deserve suspicion. This guide explains the aquamarine color range, the commercial grading terms, the Santa Maria standard, the difference between ordinary heat treatment and irradiation, and how to judge a stone in person. For the stone as a whole, see our aquamarine guide.
Aquamarine Color at a Glance
| Color family | Appearance | Typical market position |
|---|---|---|
| Ice or very pale | Nearly colorless with a faint blue tint | Most affordable; often cut large |
| Pale blue | Clearly blue but light and delicate | Very common in commercial jewelry |
| Classic seawater | Light to medium blue with a noticeable green component | Historically authentic; often priced below pure blue |
| Santa Maria | Medium to medium-dark, highly saturated blue with no brown or yellow tint | Premium; collector favorite |
| Blue-green | More green than blue | Lower priced; less fashionable |
| Maxixe-type blue | Very deep, inky blue produced in irradiated beryl; known to fade | Not true aquamarine; a collector curiosity with stability risks |
What Makes Aquamarine Blue?
Aquamarine is the blue to blue-green variety of beryl, a mineral whose formula is Be3Al2Si6O18. Other beryl varieties include emerald (green), morganite (pink), heliodor (yellow) and goshenite (colorless). The difference between them is a matter of trace elements, measured in tiny amounts. Aquamarine’s color comes from trace iron. Iron in different chemical states in the crystal absorbs some wavelengths of light and leaves the blue and blue-green we see. Some iron states push the color toward green or yellow, which is why gentle heating can leave a cleaner blue.
Because color depends on conditions during crystal growth, two aquamarines from the same mine can look noticeably different. Aquamarine is also pleochroic, meaning it can show a slightly different shade when viewed from different directions. Skilled cutters orient a stone to show the best color through the top. Natural aquamarine typically shows blue and near-colorless pleochroism; by contrast, irradiated Maxixe-type beryl looks blue from every direction.
From Ice to Ink: Reading the Spectrum
Pale or “ice” aquamarine: Very light stones, sometimes called ice or white aquamarine in the trade. Neither term is an official grade. They have a clean, minimalist look and are the most affordable. Look for a faint blue tint to distinguish them from goshenite, which is colorless beryl.
Classic seawater aquamarine: Light to medium blue with a visible green component. The name aquamarine refers to seawater, so this color is entirely authentic, even if current fashion favors purer blue.
Deep blue aquamarine: Stones with minimal green and strong saturation are the most prized. The most famous of these deep blues is called Santa Maria.
Maxixe-type blue: A very dark, inky blue that is produced by irradiating certain beryl. The color is known to fade with exposure to light. We cover this in more detail below.
The Commercial Grading Scale (Trade Terms, Not an Official Standard)
Dealers often describe aquamarine with letter grades, from top quality (sometimes called “gem” or AAAA) down to commercial grades such as A. This is a trade convention, not an official grading system, and different sellers use the letters differently. As a rough guide:
| Trade term | What sellers usually mean |
|---|---|
| Gem / AAAA / AAA | Pure or very slightly greenish blue, strong saturation, even color and eye-clean clarity |
| AA | Paler or more greenish body color; clarity may be slightly lower |
| A | Clearly aquamarine but light, washed-out or heavily greenish; the most common mass-market grade |
| B and below | Opaque, heavily included or very pale; usually cut as cabochons or used for carving |
Treat the letters as a conversation starter rather than a guarantee. Always ask the seller to describe the color, clarity, cut and treatment in plain words, and compare stones side by side.
The Santa Maria Standard
“Santa Maria” originally referred to deep-blue aquamarine from the Santa Maria de Itabira mine in Minas Gerais, Brazil. For years it was an informal trade name with no agreed definition. In June 2022, the Asian Institute of Gemological Sciences (AIGS) launched a color-grading report that sets a standard for the term. The report describes a blue of medium to high saturation without brown or yellow tints, based on reference master stones, and it applies to aquamarine regardless of where it was mined. In practice, that means a stone from Africa or elsewhere can qualify if it meets the color criteria, while the original Brazilian mine is no longer a major source.
Related trade terms such as “Santa Maria Africana” are used informally for deep-blue stones from Mozambique. They are not part of the AIGS standard, so ask for documentation if the term matters to your purchase. Origin names used in selling can also describe color rather than provenance, so request proof if origin affects price.
Blue vs. Green: Which Is “Better”?
Aquamarine ranges from blue to greenish-blue, so a green component is not a flaw. The market currently pays more for pure blue, but that is a fashion preference. Greenish-blue stones are historically authentic and can look striking in antique settings. Stones with distinct yellow or brown tones are less valued, and those tones are often reduced by heat treatment. If you like the seawater look, you can often buy more stone for the money. See our look at older styles in vintage aquamarine jewelry trends.
Heat Treatment: The Common, Accepted Enhancement
Most aquamarine comes out of the ground with a greenish tint, and most of it is gently heated to remove that tint and leave a purer blue. Sources give different temperatures, commonly in the range of roughly 375 to 450 degrees Celsius. The result is stable and permanent under normal wear, and it is accepted in the trade when disclosed. It is hard or impossible to detect, so gemologists often describe a pure-blue stone as “probably heat treated”. Naturally blue, untreated aquamarine is more valuable than a heated stone that looks the same, but heated stones make up most of the market.
Irradiation and Maxixe-Type Blue
Irradiation is a different process. Some beryl, including pale or colorless beryl, can be exposed to radiation to produce a very deep, dark blue. This material is known as Maxixe-type beryl, after a Brazilian locality that produced deep blue beryl with this behavior. It is not considered true aquamarine, its color is caused by color centers rather than iron, and the color is known to fade with light exposure. Some irradiated stones are further treated, but the key point for buyers is that extremely dark, inky blue sold at a low price is a warning sign.
If you are shown an aquamarine that looks as deep as tanzanite or fine sapphire, ask directly whether it is natural, heat-treated or irradiated, and whether the color is stable. Request documentation from a reputable gemological laboratory for valuable stones. For care advice, including light exposure, see How to Care for Aquamarine Stones.
Color Is Only One Factor
- Tone and saturation: Too dark a stone can look almost black in poor lighting. The Santa Maria standard asks for medium saturation, not the maximum.
- Clarity: Aquamarine is usually expected to be eye-clean. Heavily included stones are often cut as cabochons. Aquamarine often contains long hollow tubes that identify it as beryl, and inclusions can react badly to mechanical cleaning.
- Cut: A well-proportioned cut returns light through the top and makes color look richer, while a poor cut leaks light and looks paler. See Gemstone Shapes and Cuts Explained.
- Size: Larger aquamarines are relatively available, and very large cut stones may have a lower price per carat than smaller stones of the same quality.
How Lighting Changes Aquamarine
Aquamarine can look deeper under jewelry-store spotlights than in daylight, and different light sources shift the balance between blue and green. Always view a stone in daylight, under warm indoor light and under shop lighting before you decide. If you can, look at it next to others of similar quality, because color is relative and a stone that seemed saturated alone may look pale in comparison. Our comparison aquamarine vs. topaz for durability and color shows how it differs from the other pale blue gem often sold alongside it.
Which Color Suits Which Buyer?
| If you want… | Consider |
|---|---|
| A subtle, minimalist look | Pale or ice aquamarine in a simple setting |
| The traditional “seawater” color of the name | Classic light-to-medium blue-green stones |
| A statement blue ring | Medium-dark pure blue; ask about treatment and documentation |
| The best value | Pale to classic stones in clean, well-cut shapes |
| A collector’s piece | A stone with an independent lab report, ideally including color-grade documentation |
For engagement ring ideas that show the range of colors in settings, see 10 Most Stunning Aquamarine Engagement Rings for a 2026 Proposal.
A Practical Buying Checklist
- Set a budget before you start. Prices vary widely with color, clarity and size, so compare several sellers.
- Decide your color priority: pure blue, classic seawater or whichever you like best.
- Ask about treatment: assume heat treatment unless a report says otherwise, and ask directly about irradiation for very deep blues.
- Ask about origin only if it matters to you, and request documentation for any origin claim.
- Check evenness: turn the stone and look for zoning or pale patches.
- Check the return policy in case the stone looks different at home.
Meaning of Aquamarine Colors
Aquamarine is traditionally associated with the sea, calm and courage, and modern spiritual traditions link its colors with different qualities. These are beliefs and personal associations rather than facts, and no color has a proven effect on health or mood. If you enjoy the symbolism, see Aquamarine Meaning and Aquamarine in Mythology and History. For the science of color across gems, read The Science Behind Gemstone Colors, and see the March birthstone page for how aquamarine fits the birthstone lists.
Frequently Asked Questions About Aquamarine Color
What color is aquamarine?
Aquamarine ranges from nearly colorless pale blue through light seawater blue-green to deep, saturated blue. Its color comes from trace iron in the beryl crystal.
What is the most valuable aquamarine color?
Medium to medium-dark, saturated pure blue without brown or yellow tints, often sold under the name Santa Maria, is the most valued. Value also depends on clarity, cut and treatment.
What does Santa Maria aquamarine mean?
Santa Maria originally referred to deep-blue stones from the Santa Maria de Itabira mine in Brazil. Since June 2022, AIGS has offered a grading report that defines the color for aquamarine from any origin.
Is aquamarine heat treated?
Most aquamarine is gently heated to remove green tints and leave a purer blue. The treatment is stable, widely accepted and difficult to detect, but it should be disclosed.
What is Maxixe aquamarine?
Maxixe-type beryl is very deep blue beryl whose color comes from irradiation or color centers. It is not considered true aquamarine and the color is known to fade in light.
Is greenish-blue aquamarine less valuable?
Often it is priced lower because current fashion favors pure blue, but greenish-blue aquamarine is historically authentic and can be a good value.
Is darker aquamarine better?
Not necessarily. A very dark stone can look dull or almost black. The Santa Maria standard asks for medium saturation, and cut and clarity matter just as much.
How can I tell if my aquamarine is natural?
Look for natural color zoning and inclusions such as hollow tubes, and check for disclosure of treatment. For valuable stones, request an independent gemological laboratory report.
Ready to find your aquamarine? Browse the collections below.
[Shop GEM-Grade Aquamarine]
[Shop AAA Aquamarine]
[Shop Classic Seawater Aquamarine]
[Shop Certified Santa Maria Aquamarine]
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