The May birthstone is emerald, the rich green variety of beryl colored by chromium and sometimes vanadium. It is traditionally associated with renewal, growth and harmony, fitting for the month when spring turns fully green. Emerald is fairly hard but often fractured inside, so it needs gentler care than its Mohs rating of 7.5 to 8 suggests.
The stones
- Emerald
Color: Green · Birth flower: Lily of the valley, hawthorn
By May the trees are in leaf, the grass is thick and the whole landscape seems to have been turned up in color. Emerald is the stone that matches it, a green so vivid that the word itself has become a color name.
If you were born in May, you have one of the most storied gems in the world as your birthstone. You also have one with a practical catch: emeralds are almost always included with tiny fractures and are commonly treated with oils, which affects how you should buy and clean them. This page explains what emerald is, why it is green, what it traditionally symbolizes, the real history behind it, and how to choose, give and care for a piece without being caught out.
Which stone is the May birthstone?
The May birthstone on the American Gem Society and Jewelers of America list is emerald. It has held that place since the National Association of Jewelers set the first standard list in 1912, and May has no second official stone.
Emerald is a variety of beryl, a beryllium aluminum silicate. Pure beryl is colorless, and it is traces of chromium, and in some stones vanadium, that turn it green. The same mineral family gives us aquamarine, the March birthstone, which owes its blue to iron.
Emerald stands out among gems for its inclusions. During formation the crystals trap tiny cavities and fractures, which jewelers romantically call the jardin, French for garden. These are normal and accepted, and a completely clean natural emerald is exceptionally rare and costly. Many emeralds are treated by soaking them in colorless oil or resin to make fractures less visible, and ethical sellers disclose it.
If emerald is out of your budget, May alternatives include green tourmaline, tsavorite garnet, peridot and green sapphire. They are different minerals and should be sold under their own names, but each gives a fresh green that works as a stand-in for the birthstone.
May birthstone color
The May birthstone color is green, and emerald green is the standard against which other greens are judged. The most valued stones show a pure to slightly bluish green that is vivid and evenly saturated, neither too dark nor too pale.
The color comes from chromium and sometimes vanadium in the crystal. Colombian stones, from mines such as Muzo and Chivor, are known for a warm, intense green. Zambian emeralds tend to be a cooler, slightly bluish green and often show fewer inclusions.
Because emeralds are so often fractured, their color can look different depending on light and treatment. Look at a stone in daylight and under a lamp, and ask what treatment it has had. Minor oiling is traditional and widely accepted, while heavy filling with resin lowers value and may need re-treatment over time.
May birthstone meaning and symbolism
Green is the color of growth, so it is no surprise that emerald has long stood for renewal, fertility and the return of life in spring. In gem tradition, it is also linked with harmony and balance, and with love and loyalty. In crystal lore, emerald is associated with the heart chakra, the center said to relate to compassion and connection.
The Greek name smaragdos covered green stones in general, and the Roman writer Pliny the Elder wrote in his Natural History that a gaze at emerald was restful for the eyes. That is an ancient belief rather than fact, but the idea that green rests and refreshes is still present in how people talk about the stone.
For many people born in May, emerald is a reminder to grow at your own pace.
A quiet note: these are traditions. Emerald does not treat any illness, including eye problems or emotional distress, and it is not a substitute for medical or mental health care. Take the symbolism as a prompt for reflection if it appeals to you, and leave it alone if it does not.
History of the May birthstone
Emerald is among the oldest gems in human history. Ancient Egypt mined emerald in the Eastern Desert, and the mines there became known in later periods as Cleopatra's mines, although the connection to the queen is mostly a legend. These deposits were worked for centuries and largely exhausted.
The great modern source is Colombia. When Spanish forces reached South America in the 1500s, they found emeralds in use among the peoples there, and Colombian stones soon flowed to Europe and Asia. The Mughal rulers of India prized emeralds and often engraved them with prayers and decorative patterns, and some of those engraved stones survive in museums.
The tradition of birthstones is often traced to the Breastplate of Aaron described in Exodus, with twelve stones that later writers such as Josephus and Jerome linked to months or the zodiac. Scholars debate which minerals the Hebrew words meant, so the connection is uncertain. The modern list came from American jewelers in 1912, and emerald has been May's stone ever since.
Today, important producers include Colombia, Zambia, Brazil and Afghanistan. Synthetic and lab-grown emeralds have been produced since the 20th century, and they are legitimate gems when sold as such.
Choosing and gifting a May birthstone
Emerald is hard enough on paper, at 7.5 to 8 on the Mohs scale, but its internal fractures make it brittle. It can crack from a sharp knock, so it suits earrings, pendants and protected ring settings better than a ring worn for heavy work.
Gift ideas:
A small emerald pendant or stud earrings, which keep the stone safe from knocks.
A ring in a bezel or halo setting that protects the edges.
Green tourmaline or peridot for a lower budget.
Ask the seller whether the stone is natural or lab-grown and what treatments it has had.
For care, avoid ultrasonic and steam cleaners, because heat and vibration can damage the fractures and remove oils or fillers. Wash with a soft cloth, lukewarm water and a mild soap, and wipe dry. Do not soak it for long. Keep it away from household chemicals, take it off before gardening or cleaning, and store it separately in a soft pouch.
Zodiac stones for May
May covers two signs: Taurus, from about April 20 to May 20, and Gemini, from about May 21 to June 20. Zodiac stone lists come from several traditions and disagree with each other, so these pairings are customs rather than rules.
Emerald is the stone most often given to Taurus, the sign associated with patience, steadiness and a love of comfort and beauty.
For Gemini, the sign described as curious, talkative and adaptable, lists vary. Agate is a common traditional choice, and some lists add citrine or emerald as well.
If you were born in May, emerald is your birthstone, whatever your sign. Zodiac pairings are best used as a source of ideas, perhaps for a gift that blends birthstone and sign stone in one piece.
Frequently asked questions
What is the May birthstone?
The May birthstone is emerald, the green variety of beryl. It has been May's official stone on the American jewelers' list since 1912. Emerald is prized for its vivid color, and it is usually included with small fractures, so it needs careful handling and cleaning.
What color is the May birthstone?
Green. The finest emeralds are a pure to slightly bluish green that is vivid and evenly colored. The color comes from chromium and sometimes vanadium in the beryl crystal. Colombian emeralds tend to look warm and intense, while Zambian stones are often a cooler green.
Does May have two birthstones?
No. Modern American lists name only emerald for May. If you want a budget-friendly green, people often suggest green tourmaline, peridot or tsavorite garnet, but these are separate minerals and not official May birthstones. Emerald, natural or lab-grown, is the single stone for the month.
What does the May birthstone mean?
Emerald traditionally symbolizes renewal, growth, harmony and loyalty, reflecting its spring-green color. In crystal lore it is tied to the heart chakra. These meanings come from tradition and are not medical claims, and emerald is not a substitute for medical or mental health care.
What is the May birth flower?
May has two birth flowers: the lily of the valley and the hawthorn. The lily of the valley, with its small white bells, is often linked with sweetness and the return of happiness, and the hawthorn with hope. Both pair beautifully with the green of emerald.
Angel number meanings are for reflection and inspiration. They are not predictions, and they are not medical, legal or financial advice.