March Birthstone Aquamarine: Santa Maria & Retro Gold
Aquamarine and emerald are the same mineral. Iron turns beryl blue and chromium turns it green, and the rest of the difference comes from where each crystal grew.
A clean aquamarine over twenty carats is ordinary and a clean emerald that size barely exists, which is why one is graded on color and the other on clarity.
Santa Maria began as the name of a Brazilian mine and now works as a color description, applied to Mozambique and Madagascar stones as readily as Brazilian ones.
Almost all blue beryl on the market has been heated to drive the green out. The practice was not standard yet when Victorian and Art Deco stones were cut.
The Retro era lost platinum to the war effort in 1942 and answered with gold at scale, which made aquamarine the period's defining stone.
Aquamarine and emerald are the same mineral. Not cousins, not two members of a loose family of colored stones. The same mineral, beryl, with a different trace element caught in the crystal. Iron turns it blue. Chromium turns it green. Almost everything else that separates the two comes from where each one grew rather than what it is made of. That one fact explains most of what a buyer notices about the march birthstone aquamarine. A clean twenty-carat aquamarine is unremarkable. A clean twenty-carat emerald barely exists.
Emerald forms in tight veins under stress and comes out cracked. That is why the trade forgave it a garden of inclusions and judged it on color anyway. Blue beryl forms in open pegmatite pockets with room to spread, and it comes out large, clear and even. So no clarity language ever grew up around it. A color language did, and the two names that matter, Santa Maria and Espirito Santo, both started out as places in Brazil. That same plenty put it at the center of one era. Platinum went to the war effort in 1942 and American jewelers moved to gold and to scale, and this was the one blue gem that came big enough and clean enough to fill the new mounts.
- Why Is the March Birthstone Aquamarine?
- How Is Aquamarine Related to Emerald?
- Why Do Aquamarines Come So Large & Clean?
- What Aquamarine Color Is Most Prized?
- What Is a Santa Maria Aquamarine?
- Is Aquamarine Heat Treated?
- How Did Jewelers Use Aquamarine From Victorian to Mid-Century?
- What Are the Most Famous Aquamarines in the World?
- Is Aquamarine Durable Enough for Everyday Wear?
Why Is the March Birthstone Aquamarine?
March has two birthstones and aquamarine is the one that took over. It entered the modern American list in 1912, when the American National Retail Jewelers Association met in Kansas City and settled on one table for the whole trade.
That meeting was a business fix. Every jeweler pushed a different set of monthly stones, often whatever was sitting in the case, and the group wanted a single reference. Bloodstone had held March in the older European tradition for centuries. Aquamarine was the easier stone to keep in stock: blue, clear, and to be had in real size.
When it took the primary slot is less settled than the flat 1912 date suggests. George Frederick Kunz was Tiffany's vice president and the leading American gemologist of the day. His 1913 book printed the new table one year after the convention, and his version gives bloodstone as March's stone with aquamarine as the alternate. Modern lists of that same 1912 table reverse the two. Both cannot be right as written, and Kunz was in the room.
A later date gets the credit sometimes, and it does not hold up. The Jewelry Industry Council revised the list in 1952. The changes are on record: alexandrite to June, tourmaline to October, citrine to November, zircon confirmed for December. March is not among them. Whatever settled the order between bloodstone and blue beryl happened somewhere the paperwork does not show.
Bloodstone never left. It remains March's second stone, a dark green chalcedony flecked with red, and it carries the older sentiment. Whoever wears a jasper, by that telling, meets all dangers brave and wise and strong.
The name itself is plain Latin, aqua marina, sea water. Roman writers had a word for the same stone inside the beryl group: aeroides, sky blue. March's gem also marks the nineteenth wedding anniversary. Colorado made it the state gem in 1971, on the strength of crystals coming off Mount Antero at twelve to fourteen thousand feet. The birthstone jewelry guide runs all twelve months. September's sapphire and October's opal came through the same 1912 standard, and October's tourmaline is one stone the 1952 revision genuinely did add.
How Is Aquamarine Related to Emerald?
They are the same mineral. Beryl is a beryllium aluminum silicate, and the two are color varieties of it, split only by which trace element got into the crystal.
The family runs wider than those two. Iron gives blue aquamarine and yellow heliodor. Chromium and vanadium give emerald its green. Manganese gives pink morganite and red beryl. With no coloring element at all, beryl is colorless goshenite. Same formula every time, same six-sided crystal, hardness within half a step across the whole group.
The trade sorted the family by color long before anyone could explain it chemically. Roman writers treated beryl as one group and ranked it in five grades. Sea green sat at the top, then the golden ones, then a paler green, then a sapphire-blue kind, and last the sky-blue aeroides. They also knew it needed help. Beryl reached Rome from India already cut to a smooth hexagon, and Natural History gives the reason: color goes dead across a plain face and lifts when facets bounce light back through the stone. Cutters are still working on that problem.
Where the two part company is geology. Emerald needs chromium, which almost never sits alongside beryllium, so emerald deposits are accidents in narrow, stressed veins. Blue beryl needs only iron, which is everywhere, and it grows in granite pegmatite cavities with space around it. One stone comes out small and cracked. The other comes out large and clear.
The result shows up at the bench. An emerald gets oiled, set in a guarded mount, and kept well away from an ultrasonic cleaner. An aquamarine of the same weight takes an ordinary prong setting and ordinary cleaning. May's emerald is the direct comparison: same mineral, opposite handling. Blue topaz sits outside the family and has been sold under the aquamarine name for well over a century. Density is the reliable split. Beryl floats in a liquid where topaz, corundum and euclase all sink.
Why Do Aquamarines Come So Large & Clean?
Because the crystals grow big and the growth is calm. Beryl in a pegmatite pocket has both room and time, and the result is long clear prisms instead of the cracked crystals emerald makes.
The record on size is old and specific. A fifteen-pound pebble came out of the Minas Novas district in 1811. A four-pound crystal turned up at Vallongo in 1825, along with a faultless clear stone seven inches long. A Parisian jeweler of the same century handled rough of roughly twenty-two pounds. The British Museum holds a faceted stone of 875.5 carats. In the 1950s the Martha Rocha crystal came out of Brazil at 134 pounds and gave up more than three hundred thousand carats of cut gems.
Clarity follows from the same conditions. The standard gemology text of 1904 says it flatly: flawless, perfectly clear beryl is far less rare than the emerald equivalent. Some crystals do carry cloudy patches, clusters of tiny cavities that will not take a polish, and a cutter removes those rather than working around them. The long hollow growth tubes running through beryl are the family's tell, and in aquamarine there are usually few enough to cut past. Dense and parallel, they give a cat's eye instead.
Emerald is fragile because of what happened to it in the ground, not because of what it is
So the expectation flips. With emerald, visible inclusions are normal and a garden is part of the character. With aquamarine, eye-clean is the baseline, and obvious inclusions mean something is wrong. None of this makes one tougher than the other. Both sit at 7.5 to 8 on the Mohs scale. Emerald is fragile because of what happened to it in the ground, not because of what it is.
Size also changes what a designer can try. A thirty-carat stone is a choice rather than an event, which is why estate cases hold so many enormous blue ones and so few enormous green ones. Filigree's aquamarine jewelry runs from small stud earrings up past sixty carats in a single stone, and that spread is a property of the mineral.
What Aquamarine Color Is Most Prized?
Pure blue with no green in it, at a medium to moderately dark tone. Most of what the mines give up is lighter than that and leans green, which is why the deep even blues get the attention.
The march birthstone color runs from a faint sky blue through blue-green to a strong sea blue. Depth is the scarce part. Tone that dark is uncommon at any size, and it is why one deep stone stands out beside a case of paler ones. Deep color also survives a large mount, which matters more than it sounds.
Pale color puts the burden on the cutter, and the 1904 text states the rule: a cut stone needs a certain depth or the color looks too faint. That is why so many good blue beryls have deep pavilions. Light has to travel far enough through the gem to pick up color before it comes back out. A shallow stone windows instead. It goes watery and nearly colorless through the middle, where light passes straight through and gathers no blue at all.
Orientation matters as much as depth, because the stone is dichroic. Down the length of the crystal the blue is at its strongest. Across it, the same crystal goes pale, near colorless with a greenish cast. A cutter who lines the table up with the strong axis gets the best blue the crystal has in it. A cutter chasing weight out of a long prism can lose most of it.
Two checks are worth running. Turn the stone under a single light and watch whether the color holds across the whole face or pools at one end. Then set it on white paper and look through the middle. If the paper shows through the center, the pavilion is too shallow for the size. Cut is doing more work here than in almost any other colored gem, because there is no clarity story to fall back on.
What Is a Santa Maria Aquamarine?
Santa Maria is a color, not an origin. The name comes from the Santa Maria de Itabira mine in Minas Gerais. Its rough set the mark for deep medium-dark blue, and the name now travels with that color wherever a stone was dug.
The mine earned it honestly. Its output was unusually deep and unusually even, and the trade wanted shorthand for that grade. Then production tailed off. The color did not go with it. Mozambique, Madagascar and Nigeria all yield rough in the same range, and a santa maria aquamarine on a modern ticket is as likely to be African as Brazilian.
Espirito Santo works the same way. It is another Brazilian state, and the name attaches to a lighter, brighter, very clean blue rather than a deep one. Neither term is a graded or certified word. No laboratory issues a Santa Maria report, and there is no line a stone crosses to earn the description. Both are trade language rather than gemology.
That does not make them useless. Used with care, they tell you what a seller thinks the blue looks like, which is worth knowing. The question to ask is which claim is being made. Is Santa Maria describing this stone's color, or asserting where it came from? If it is origin, ask what the call rests on. Beryl gives up its birthplace far less readily than ruby or sapphire does, and origin reports for it are rare for that reason.
Color grading here still happens the old way, by eye, against other stones, in daylight. Two gems can carry the same trade name and look nothing alike side by side. Filigree keeps a platinum ring set with a Santa Maria stone at the deep end of the range. Stand it next to a paler one and the name stops being abstract.
Is Aquamarine Heat Treated?
Almost always. Nearly every blue beryl on the market has been heated to drive out the green, and the change is permanent, stable and undetectable.
Aquamarine heat treatment works on iron. Iron sits in the crystal in two states. The ferric form gives yellow and green. The ferrous form gives blue. Heating it in an oxygen-poor atmosphere, somewhere around 375 to 450 degrees Celsius, turns one into the other. The green leaves, the blue stays, and no test separates the result from a stone that came out of the ground that way. Disclosure standards still call for the statement. The color itself will not fade, reverse, or need upkeep.
Which is what makes the older stones interesting. The 1904 gemology standard walks through the natural range at length, sky blue to blue-green. It says nothing at all about heating, because the practice was not yet routine. The same book records a test on common greenish and yellow beryl from Dublin that lost its color completely after an hour at 357 degrees. The period knew heat moved beryl color. It had not yet made that a production step. So a Victorian or Art Deco stone is likelier than a modern one to show the color it was cut with, green cast and all. That is a fair thing to want. It is not a thing a lab can confirm.
One blue beryl needs watching. In 1917 the Maxixe mine in Minas Gerais gave up a deep blue stone colored by radiation damage rather than iron. It fades to brownish yellow within weeks of sunlight or mild heat. Similar goods, irradiated on purpose, turned up again around 1970 and behave the same way. It can be told apart: Maxixe lacks the normal dichroism and shows a different absorption spectrum. In estate terms, two things call for a second opinion. One is a blue too deep to be likely at that size. The other is a stone that has visibly shifted color across decades in a drawer.
Heat matters at the bench too. Treatment heat sits well inside what a jeweler's torch reaches, so sizing a shank or retipping a prong on one of these rings means taking the stone out first. Skipping that step can lighten a blue stone for good, and it is a fair question to ask before leaving a piece for repair.
How Did Jewelers Use Aquamarine From Victorian to Mid-Century?
This gem appears in every era from the Victorian period forward, but it became a period signature only once. Retro jewelry needed a large clean colored gem, and this was the one that existed in quantity.
Victorian (1837 to 1901). Victorian aquamarine is smaller and quieter than what came later. The Cooper Hewitt holds a French bracelet of about 1840, gilt metal set with the stone, still in its fitted box. A mid-century Italian pendant there pairs it with gold and black and white enamel. Both use the blue as a color note inside metalwork rather than as the subject.
The period's mounting habits are documented and checkable. A pale stone went onto silver foil, or into a closed setting with a black lining, to push its color back out. Only the finest went open at the back, where nothing helped them. Long thin prisms gave elongated girdles, so Victorian stones are more often narrow rectangles and stretched ovals than rounds. And because beryl is soft enough to work, it was a traditional vehicle for engraving. Filigree's two Victorian pieces run to type. One is a fifteen-karat gold Maltese cross built around a square step cut. The other is a small round stone in a buttercup mount. The Victorian jewelry guide covers the era's construction vocabulary in full.
Art Deco (1920 to 1935). Deco handed it a job it was built for. The era wanted geometry, and it wanted gems cut to fit a plan, and a step-cut aquamarine is a rectangle by nature. The Metropolitan Museum of Art holds a gold and aquamarine stickpin from the turn of the century, plus four necklaces that arrived with the Catherine D. Wentworth bequest in 1948. The Victoria and Albert Museum has a platinum ring by Bailey, Banks and Biddle, dated 1930 to 1940, set with aquamarine, diamonds and a ruby. That is the period in one object: white metal, one blue stone, a red accent, hard edges.
The top of the market went further. Jean Fouquet built a gold and silver necklace around 1925 to 1930 on a ninety-carat cut-cornered rectangular stone, a piece that has since sold at auction in Paris. Filigree's own Deco pieces work the same way at a wearable size. One is a 15.31-carat blue stone in platinum and yellow gold. The other is a 5.75-carat oval in a platinum filigree pendant.
Retro (1935 to 1950). This is where it takes charge. The War Production Board restricted platinum for military use in 1942, and American jewelers went to rose and yellow gold. Gold at that moment was worked into scrolls, ribbons and domes with real bulk. Bulk needs a center stone that can hold its own against a lot of metal. Diamonds were small and rationed by circumstance. Emerald was small by nature. Aquamarine arrived in twenty, thirty and fifty carats, clean, in a blue that sits well against both pink and yellow gold.
The houses that built on it are named and dated. Trabert and Hoeffer-Mauboussin was a 1936 partnership between the American firm and Parisian Mauboussin. Its Reflection line, under designer Gustave Toth, used pre-cast parts a client could combine, and big blue stones in rose-gold scrollwork were the house mark. Fulco di Verdura opened on Fifth Avenue in 1939 after designing for Chanel, and wrapped heavy textured gold cuffs around single large gems, this one among them. Paul Flato worked the Hollywood end with figural gold brooches and outsized colored stones.
The museum record backs the pattern up. Valentine Rippon made a gold and aquamarine brooch in 1953. An unattributed platinum bracelet from 1950 to 1960 sets the stone with diamonds and has a matching necklace, both in the V&A. Sah Oved's necklace of about 1950, titled Life Began in Water, sets several with agates and jasper in gold and silver. The title tells you how literally the sea link was still taken.
Mid-Century (1950 to 1970). It stayed useful, and the handling of it changed. Chaumet made a brooch, ring and earring in sapphires and aquamarines. Jean Schlumberger's Bird on a Rock came to Tiffany in 1965: a gold and enamel bird perched on one large faceted gem. The first was a topaz, and blue beryl versions followed. It flips the usual order by making the gem a plinth. Andrew Grima stopped cutting altogether, mounting rough uncut crystals in textured gold that grew around them like bark. His career began when two Brazilian dealers carried a suitcase of large aquamarines and tourmalines into his father-in-law's firm.
The commonest survivor from these decades is the piece that fills estate cases now: a large emerald-cut stone in a four-prong basket on a gold band. Filigree has a 34.21-carat one. That is Retro logic in a mid-century silhouette, and it is why a big aquamarine cocktail ring feels era-specific in a way a big sapphire never does.
What Are the Most Famous Aquamarines in the World?
The Dom Pedro is the largest faceted aquamarine ever cut. The best-documented story, though, belongs to Queen Elizabeth II, whose Brazilian suite was built up piece by piece across nearly twenty years.
The Dom Pedro began as a crystal from a Brazilian pegmatite in the late 1980s, over twenty-three inches long and close to sixty pounds before cutting. Bernd Munsteiner studied it for months first. His method, tapering facets cut into the reverse faces so light reflects inside, leaves the finished obelisk looking lit from within. It stands fourteen inches tall, weighs 10,363 carats, and sits in the Smithsonian's Janet Annenberg Hooker Hall about thirty feet from the Hope Diamond. The name honors Brazil's two emperors.
Brazil has used it as a diplomatic gift more than once. In 1936 the government sent Eleanor Roosevelt a dark blue rectangular step cut of 1,298 carats, now held at the Franklin D. Roosevelt Presidential Library in Hyde Park. In 1953 it sent the newly crowned Queen a necklace and pendant earrings made in Rio de Janeiro by Mappin and Webb.
What followed is the interesting part, because it ran for three decades. In 1957 the Queen went to Garrard herself and had a matching tiara built. It is a platinum and diamond bandeau with three blue ornaments across the top, first worn to a film performance in Leicester Square. Brazil added a bracelet and a brooch in 1958, then hair ornaments in 1968. In 1971 Garrard rebuilt the tiara again. The center became a much larger emerald-cut stone set upright, four fan-shaped motifs went on, and the height more than doubled. One wearer, one gem, one commissioning relationship, on the record at every step.
Older famous stones exist and they are quieter. The British Museum's 875.5-carat gem has been catalogued since the nineteenth century. Kunz described a domed blue stone engraved with the head of Julia, daughter of the emperor Titus. Charles the Bald gave it to the Treasury of St Denis in the ninth century. By that account the Roman portrait was later venerated there as an image of the Virgin Mary, which is a strange second life for a court engraver's piece of flattery.
Is Aquamarine Durable Enough for Everyday Wear?
Yes, with the setting doing the work. Aquamarine sits at 7.5 to 8 on the Mohs scale, which handles daily wear well. What it handles poorly is a hard knock on an exposed corner.
Hardness and toughness are separate questions. Hardness is scratch resistance. At 7.5 to 8, beryl sits above quartz, which is most of what house dust is made of, so it keeps its polish through normal wear. Toughness is impact resistance, and beryl is only fair there. Cleavage is indistinct, so it will not split along an inner plane the way a diamond can, but it breaks unevenly and it chips.
Cut shape decides where the risk sits. The emerald cut that suits this gem best has four clipped corners, and a corner is the thinnest part of any stone. In an open four-prong basket those corners are out in the world. A bezel or half-bezel wraps the girdle in metal and takes the hit instead. Corner prongs on a step cut do the same job on a smaller scale. It is part of why so many surviving Retro and mid-century rings are still sound: the mounts around them were heavy to begin with.
Then match the piece to the wear it will get. Earrings and pendants almost never take an impact, so a large stone in either is low risk whatever the hardness number says. A cocktail ring goes on and off for evenings. An engagement ring is different in kind. It is worn constantly, through cooking, gardening, gym equipment and car doors, and constant wear finds every exposed edge in the end. An aquamarine engagement ring works. It works better bezel-set, in a lower profile, with the understanding that the prongs want checking more often than a sapphire's would.
Care is simple. Warm water, a drop of mild dish soap, a soft brush. Skip the steamer, and skip the ultrasonic if the stone shows any visible break, since vibration works on breaks that already exist. Keep it away from a bench torch. Store it apart from harder gems, because a loose diamond in the same pouch outranks it. The jewelry care guide covers cleaning by stone type, and Filigree's aquamarine jewelry spans earrings, pendants, bracelets and rings for exactly this reason. Category matters more here than carat weight.
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Aquamarine Jewelry
March's stone across rings, earrings, pendants and bracelets, from Victorian and Art Deco pieces to modern statement stones.
Browse Aquamarine →Cocktail Rings
Where the largest estate aquamarines end up: step cuts and ovals in heavy gold and platinum mounts, Retro through modern.
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The complete birthstone calendar with Filigree's pieces for every month of the year.
View the Guide →The coolest blue in the calendar
Aquamarine is the birthstone whose whole character comes from geology being generous. Beryl needed only iron to turn blue, iron is everywhere, and the crystals grew in open pockets with room to get large and stay clear. Everything downstream follows from that.
The trade graded it on color because clarity was never the question. Heating became standard because green was the only real defect. And the Retro era, pushed off platinum and into gold at scale, found the one colored stone it could get big enough to match its ambitions. The full range, Victorian through modern, is in Filigree's aquamarine jewelry.
Ready to Find Your March Stone
From a Victorian Maltese cross and Art Deco platinum filigree to Santa Maria color and sixty-carat statement stones, the collection spans the full range of March's gem.
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March Birthstone Aquamarine
Is aquamarine the only March birthstone?
No. Bloodstone shares the month and has the older claim, holding March in European tradition for centuries before the 1912 American list set aquamarine beside it. Bloodstone is a dark green chalcedony flecked with red iron oxide, opaque where aquamarine is transparent. Most March jewelry now uses the aquamarine birthstone, but both are correct.
What is the difference between aquamarine and blue topaz?
Different minerals that look alike. Aquamarine is beryl colored by iron. Blue topaz is an aluminum fluorosilicate, and nearly all of it starts colorless and is irradiated and heated to blue. Topaz has been sold under the aquamarine name for well over a century. Density is the reliable separation, and any gemologist can settle it quickly.
Is aquamarine related to emerald and morganite?
All three are beryl. Aquamarine is iron blue, emerald is chromium green, morganite is manganese pink, heliodor is iron yellow, and colorless beryl is goshenite. Same formula, same crystal system, hardness within half a step of one another. The differences that matter in a finished piece come from how each variety formed rather than from the mineral.
Can aquamarine be worn as an engagement ring?
Yes. At 7.5 to 8 on the Mohs scale it takes daily wear better than opal, pearl or emerald. The two things to get right are the setting and the profile. A bezel or half-bezel protects the girdle and the clipped corners of a step cut, and a lower mount collects fewer knocks. Plan on having the prongs checked more often than with a sapphire.
How do you clean aquamarine jewelry?
Warm water, a drop of mild dish soap, a soft brush, and a lint-free cloth. Avoid steam cleaning. Avoid an ultrasonic if the stone shows any fracture, because vibration works on existing breaks. Heat is the real hazard, so any torch work at the bench should be done with the stone removed.
