Birthstones by Month: May's Emerald, Agate and Chrysoprase

When you line up the birthstones by month, May turns out to be one of the steadiest entries: every modern list gives it emerald, the deep green gem that has stood for spring and renewal for centuries. Emerald has company, though. Older traditions gave the month agate, and Britain’s list adds chrysoprase. Each choice tells a slightly different story about how birthstones came to be. Below you will find what each list says, what the three stones mean in crystal lore, how people wear and care for them, and a quick chart for the rest of the year.

What Is the Birthstone for May?

The short answer is emerald. On almost any chart that sorts birthstones by month, May starts with emerald. It is the one stone that appears under May on the traditional European lists from the fifteenth to the twentieth century, on the American list of 1912, and on the later American and British lists. Few months are this consistent. March has swapped its main and alternate stones, and December has changed several times. May has stayed green from the start.

The longer answer is that “birthstone” has never been one fixed rule. The idea grew out of old writings linking twelve gems to the twelve stones of the high priest’s breastplate described in Exodus, and later to the foundation stones of the New Jerusalem. Early Christians kept a set of twelve stones and wore one each month. Wearing a single stone for the month you were born in came much later. Some historians place it in sixteenth-century Germany, others in eighteenth-century Poland.

Today’s lists come mostly from trade bodies. American jewelers met in Kansas City in 1912 to standardise the list. It was revised in 1952 and has had additions since, such as tanzanite for December and spinel for August. Britain’s goldsmiths drew up their own list in 1937. So when you read a chart of birthstones by month, May’s entry reflects a tradition shaped by faith, folklore and commerce together. That is part of its charm. Our note on how the journal approaches crystal traditions explains how we treat lore like this.

Birthstones by Month: May on Each List

When people ask “what are the two birthstones for May?”, they are usually noticing that different charts disagree. Here is how the main lists compare for the month:

None of these is “wrong”. Across the old and new charts of birthstones by month, May keeps emerald and adds an optional second stone depending on the list. If you were born in May and love banded stones, agate has an older claim to the month than many modern additions elsewhere in the calendar. If you love green but want something relaxed enough for daily wear, chrysoprase has the British list behind it. The broader picture is in our guide to what the birthstones by month are, and for the history across every month see birthstones by each month.

Emerald: May’s Main Birthstone

What it looks like

Emerald is a green gem. The finest stones show a saturated, slightly bluish or pure green that seems to glow from within. Unlike many clear gems, emeralds almost always contain inclusions: tiny crystals, fractures and wisps trapped inside as the stone grew. Jewelers often accept these as normal and even affectionate signs of a natural stone. A perfectly clean-looking emerald is unusual enough that buyers tend to look at it twice.

Mineral background

Emerald is rated as a hard gem on the Mohs scale, the ten-step scale that ranks minerals by how well they resist scratching. Hardness is not the same as toughness, though. Because emeralds are so often included, a sharp knock can chip or crack them more easily than their hardness suggests. Many emeralds are also treated with oils or resins to make small fractures less visible, which affects how you should clean them (more on that below). Emerald falls under the “earth treasures” in our library, alongside most precious gems; browse that group on our Earth treasures page.

Meanings in tradition

In crystal traditions emerald is believed to be a stone of love, loyalty and renewal. Its colour ties it to spring growth, and its place as the May birthstone adds to that sense of fresh beginnings. Folklore credited emerald with sharpening insight and even revealing whether a lover was faithful. Legend links emeralds with Cleopatra, and the stone has long been a mark of royalty and wealth. In chakra practice (chakras are energy centres described in yogic and later New Age traditions), green stones such as emerald are usually linked with the heart chakra, so many people choose emerald for practices centred on compassion and open-heartedness.

How people use it

• Jewelry: the most common way to wear a May birthstone. Pendants and earrings are safer settings than rings, because they take fewer knocks.
• Meditation: some people hold a small rough (uncut) emerald while focusing on gratitude or kindness, as a personal ritual.
• At home: a raw emerald in matrix (the host rock it grew in) makes a quiet display piece on a bookshelf or desk.

If you want to see raw and polished stones together before choosing, Spirit Magicka, the journal’s own crystal shop, is a place to start browsing crystals and minerals.

Agate and Chrysoprase: May’s Alternative Stones

Agate

Of May’s two alternative stones, agate has the longer history. It belongs to the quartz family and is known for its bands: curving rings of colour that formed layer by layer inside cavities in rock. Slices are often backlit to show those rings, and the colours run from soft grey and blue to warm browns and reds. Agate is fairly tough and handles daily wear well, which is one reason it was so widely carved and worn in earlier centuries.

In crystal traditions agate is seen as a grounding, steadying stone, believed to support balance and patience. It is also the traditional zodiac stone for Gemini, which covers late May, so it has a double link to the month. People often carry tumbled agate (small stones smoothed by rolling in a barrel with grit) in a pocket, or use slices as coasters and window hangings. Learn more about the group in our Quartz & family collection.

Chrysoprase

Chrysoprase is Britain’s addition to the May line-up. It is a bright apple-green stone, opaque to slightly translucent, with a soft and even glow rather than sparkle. It is usually cut into smooth domed cabochons or beads instead of faceted gems. On the British list it sits beside emerald, giving May birthdays a fresher, lighter green to choose from.

In tradition chrysoprase is linked with optimism, forgiveness and a cheerful heart. Like emerald, it is often associated with the heart chakra. People wear it as a bead bracelet or keep a tumbled piece near a workspace as a reminder to stay light-hearted. One practical note: strong sunlight over long periods may fade some green stones, so jewelers often suggest storing chrysoprase out of direct sun.

May Birthstones by Zodiac Sign and Weekday

Birth months and star signs do not line up neatly, which gives May birthdays a few extra options. Standard lists of birthstones by month, May included, leave zodiac stones out, but they make a lovely second layer of meaning. Under one traditional set of zodiac stones:

• Taurus (20 April to 20 May): sapphire. If you were born in the first three weeks of May, a blue sapphire is your zodiac stone. Our article on September’s sapphire and lapis covers its lore.
• Gemini (21 May to 20 June): agate, which ties neatly to May’s traditional second stone.

There is also an older custom of weekday stones, separate from the month lists. Emerald is the stone for both Tuesday and Friday in that tradition. A May baby born on a Tuesday or Friday has an especially strong emerald connection, which can be a sweet detail to mention in a birthday card.

Hindu tradition takes a different route entirely. Instead of months, it links nine gems, the Navaratna, to celestial bodies, and an astrological chart drawn up at birth guides which stones a person wears. If you are buying for someone who follows that practice, ask rather than assume the Western list applies.

How to Choose and Wear a May Birthstone

In the published lists of birthstones by month, May offers more choice than it first appears. Picking one becomes easier once you weigh lifestyle, budget and meaning together. Here is a worked example.

A worked example

Say you are buying a gift for a friend born on 28 May who works with her hands, gardens at weekends and rarely takes off her jewelry. An emerald ring is the classic choice, but it would face daily knocks against tools and stone, which is exactly what an included emerald dislikes. Three better routes:

1. Emerald, protected setting: small emerald stud earrings or a pendant keep the official stone while avoiding most impacts.
2. Agate, everyday piece: as a Gemini, she has agate as both a traditional May stone and her zodiac stone. A banded agate bracelet can take garden life in its stride.
3. Chrysoprase, bright green: a chrysoprase cabochon pendant gives her the green of May with a relaxed, cheerful feel.

Any of these is a genuine May birthstone. The best one depends on the person, not the chart.

Common mistakes

• Treating one chart as the only truth. Lists vary by country and era; across the published birthstones by month, May has carried three different stones. Agate and chrysoprase are legitimate choices.
• Choosing a ring for a hands-on wearer. Emerald rings are lovely but need care. Consider earrings or pendants for active lives.
• Confusing “green stone” with “emerald”. Many green gems look similar. If the stone matters to you, ask what it is and whether it has been treated.
• Expecting a stone to do the work. In crystal traditions a birthstone is a symbol and a focus for intention. It does not replace care, effort or professional help.

If you like layering stones, our guide on how to use chakra stones shows simple ways to combine a heart-chakra green with other colours. When you are ready to look at stones in person, Spirit Magicka is worth a browse.

How to Care for May Birthstones

Among all the birthstones by month, May asks for some of the gentlest cleaning, because emerald is so often included and treated. Agate and chrysoprase are more forgiving, but each stone still has its own needs.

Emerald care

• Clean with lukewarm water, a drop of mild soap and a soft brush, then pat dry with a soft cloth.
• Avoid ultrasonic cleaners, steam and harsh chemicals. They can loosen or strip the oils and resins many emeralds are treated with, and they can stress existing fractures.
• Take emerald rings off for gardening, cleaning, the gym and anything that involves knocks.
• Store separately in a soft pouch so harder gems cannot scratch it and it cannot scratch softer pieces.
• Avoid sudden temperature changes, such as moving from a hot bath to cold water.

Agate and chrysoprase care

• Both rinse well in lukewarm soapy water and dry with a soft cloth.
• Keep chrysoprase out of long spells of strong sunlight to help protect its colour.
• Some agate on the market is dyed to brighter blues, pinks or purples. Dyed pieces may fade or bleed, so keep them out of long soaks.

A note on energetic cleansing

Many crystal lovers like to “cleanse” their stones energetically. Of May’s three stones, emerald is the one to keep away from water rituals, so choose dry methods: a few minutes in smoke from incense, a sound bowl, or resting the stone on a windowsill in moonlight. Avoid salt soaks and long water baths, which can damage treated stones and settings. Never make crystal “elixirs” by leaving emeralds or other treated or dyed stones in drinking water.

Birthstones by Month at a Glance: The Full Year

Many readers come for May and then want the rest of the family’s birthdays too. Here are the modern American stones for every month, with older or British alternates where they differ:

For the neighbouring months, see June’s pearl, moonstone and alexandrite, February’s amethyst, March’s aquamarine and bloodstone and August’s peridot, spinel and sardonyx. If colour matters more to you than tradition, our chart of colors for birthstones by month groups them by hue.

Lists keep changing, too. Japanese industry groups added ten new birthstones in 2021, and the American list gained spinel for August in 2016. Through every revision to the birthstones by month, May has stayed remarkably stable, which says something about how firmly emerald’s green belongs to the season.

Whether you choose emerald for its history, agate for its everyday toughness or chrysoprase for its bright, easy green, the right May birthstone is the one that feels like the person wearing it. Explore more stones in the full crystal library, and when you are ready to hold a few, visit Spirit Magicka.