Every month has its gem, and some have three. What each one is, what it has meant to the people who wore it, and which ones are sturdy enough for every day.
By Liz Sterling·October 1, 2026·7 min read
A birthstone is the smallest kind of biography. One gem, one month, one person. It says: this was made with you in mind.
The custom is old, and the list we use is younger than it looks. American jewelers first agreed on it in 1912 and have added to it since, which is why some months now have two gems or three. Here are all twelve.
The twelve months
Month
Gem
Its color
What it has stood for
January
Garnet
Deep red, and also green and orange
Calm
February
Amethyst
Lilac to deep purple
A clear head
March
Aquamarine
The pale blue of clear water
Safe passage; a happy marriage
April
Diamond
Colorless, and every color
Strength and clarity
May
Emerald
Green
Spring and renewal
June
Pearl, alexandrite, moonstone
White; green turning red; a floating sheen
Purity; good fortune
July
Ruby
Red
Passion and love
August
Peridot, spinel
Lime green; red, pink and blue
Protection; harmony
September
Sapphire
Blue, and every color but red
Truth and faithfulness
October
Opal, tourmaline
A play of every color; pink and green
Hope
November
Topaz, citrine
Golden, blue and pink; sunny yellow
Good fortune; calm
December
Turquoise, tanzanite, zircon, blue topaz
Sky blue; violet blue; bright blue; clear blue
Protection and peace
The meanings are stories, handed down for centuries. Nobody has to believe them for them to matter.
One gem, one month, one person.
Winter: garnet, amethyst, aquamarine
Garnet is January's, and it is not only red. It comes in green and orange too, though the deep red is the one people picture. Amethyst, for February, is the purple the Greeks believed kept a clear head. Aquamarine takes its name from seawater, and sailors once carried it for calm crossings. It is March's gem, and one of the sturdier ones.
For MarchCushion Cut Aquamarine and Diamond Halo RingGabriel & Co., in 14K yellow gold.See the aquamarine ring
Spring: diamond, emerald, and June's three
April has the diamond, the hardest thing in nature. May has the emerald, whose green has meant spring for as long as anyone has written about gems. Many emeralds are treated to improve their clarity, so they are cleaned gently and kept away from heat.
June has three. The pearl is the gem made inside a living shell, soft and luminous. Alexandrite is green by day and red by lamplight, and very rare. Moonstone holds a pale glow that moves across it as it turns.
For AprilDiamond Engagement RingGabriel & Co. An oval diamond, in 14K white gold.See the diamond ring
Summer: ruby, peridot, spinel, sapphire
Ruby, for July, is the red of the gem world, as hard as sapphire and second only to diamond. August has peridot, a bright lime green, and spinel, which comes in reds and pinks so fine that for centuries it was mistaken for ruby. September has sapphire: blue above all, but found in every color except red.
For September18K White Gold Sapphire RingThe J. David Legacy Collection. A 2.90-carat sapphire in a double halo of diamonds.See the sapphire ring
Autumn and the year's end
October's opal carries flashes of every color in one gem, and no two are alike. Its companion, tourmaline, comes in more colors than almost any other gem. November has topaz and golden citrine. And December has its blues: turquoise, worn for thousands of years; tanzanite, found in one place on earth; bright zircon, which is a gem in its own right and has nothing to do with the imitation that borrowed part of its name; and blue topaz, the clear blue that many lists add.
For DecemberBlue Topaz Bujukan Promise RingGabriel & Co., in 14K yellow gold.See the blue topaz ring
Which ones to wear every day
A ring lives a harder life than a pendant, and not every gem is made for it.
The softer gems share one rule: keep them out of ultrasonic and steam cleaners. A soft cloth is all a pearl or an opal wants. Bring any of them by and we will clean it the way that gem should be cleaned.
A gift that says one thing
A birthstone is rarely chosen for oneself. It is chosen for a mother, with a gem for each of her children. For a daughter turning sixteen. For a wife, in the month you met.
Come and tell us who it is for. At any of our three Tulsa showrooms we will lay the gem in your hand, in more than one shade, and help you find the piece that carries it. And if it should hold a whole family's months at once, our own goldsmiths will make it.
Yes. A birthstone is a tradition, not a rule. People choose a gem for its color, for someone they love, or simply because it is the one they cannot stop looking at.
Why do some months have more than one birthstone?
The list has been added to over the years. It was first set down by American jewelers in 1912, and gems were added in 1952, 2002 and 2016. The extra gems give each month more than one color and more than one price.
Which birthstones are sturdy enough for a ring worn every day?
Diamond, ruby and sapphire first, then spinel, alexandrite, aquamarine, amethyst, tourmaline and citrine. Pearl, opal, turquoise, tanzanite, peridot and moonstone are softer and are happier in earrings, pendants or a ring kept for occasions.
What is the rarest birthstone?
Alexandrite is the one most often named. Fine alexandrite, which turns from green in daylight to red under lamplight, is very rare.
Is blue topaz a December birthstone?
On some lists. Jewelers of America names turquoise, tanzanite and blue zircon for December, and blue topaz appears on others. Any of them is a true December gem.
Do birthstones really have meanings?
They have stories. The meanings are traditions handed down over centuries, not properties of the gem. That is no reason not to love them.
The Inner Circle
First look, before anyone else.
New pieces as they land, the evenings we open the doors after hours, and now and then a story from the bench.
Every heirloom begins with a story. Hear from the families who let us be a part of theirs.
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