May Birthstone Guide: Emeralds & How to Choose

May’s birthstone, the emerald, has been prized by humans for at least 3,500 years. From Cleopatra’s Egyptian mines to the velvet display cases of modern jewelers, the emerald carries a richer cultural history than almost any other gemstone — and it asks more of its owner. Choosing one well requires a different set of considerations than choosing a diamond, which is exactly what makes it interesting.

This guide walks through what makes May’s birthstone unique, the lore behind it, the practical knowledge you’ll need to evaluate an emerald (which differs significantly from evaluating a diamond), and how to think about emerald jewelry as both an everyday piece and a long-term family heirloom.

Why the Emerald Is May’s Birthstone

The modern birthstone list assigning the emerald to May was standardized by the American National Retail Jewelers Association — now Jewelers of America — in 1912. But the emerald’s symbolic association with rebirth, fertility, and eternal love runs much older. The word "emerald" derives from the Ancient Greek smaragdus, meaning "green gem," via Latin and Old French. The pairing with May aligns naturally with the spring season in the Northern Hemisphere — green being the color of new growth and renewal.

Cleopatra famously laid claim to all of Egypt’s emerald mines, and emeralds from the ancient mines at Wadi Sikait in Egypt’s Eastern Desert have been mined for at least 3,500 years. Long before European contact, the Muzo people of what is now Colombia mined emeralds and considered them sacred — those same Muzo mines remain one of the world’s most prestigious sources today. Roman emperors wore them. Mughal craftsmen carved Quranic verses into them.

For someone born in May, the emerald carries a depth of cultural and historical significance unmatched by most birthstones. It’s the traditional gemstone for the 20th and 35th wedding anniversaries, and it sits alongside diamond, ruby, and sapphire as one of the four classic precious gemstones.

The Meaning and Symbolism of Emeralds

Across cultures, emeralds tend to represent four things in particular:

•      Renewal and growth — the deep green echoes the color of spring, of new life, and of fresh starts.

•      Love and fidelity — emeralds have been associated with romantic love and unwavering loyalty for millennia.

•      Wisdom and clarity — many traditions credit emeralds with the power to see truth and enhance foresight.

•      Royalty and power — historically reserved for monarchs, conquerors, and high priests across multiple civilizations.

Wearing an emerald as your birthstone is, in many ways, wearing the most storied gemstone in the world. Few pieces feel more like an heirloom from the moment they’re set.

How to Actually Evaluate an Emerald

The same 4 Cs framework used for diamonds — color, clarity, cut, and carat — also applies to emeralds, but the weighting is fundamentally different. Color is paramount; clarity is judged by an entirely different standard; and origin and treatment, which barely register in diamond grading, become central to evaluating an emerald’s value.

Color

For emeralds, color is everything. Industry estimates put color at 50–70% of an emerald’s total value. Three components matter:

•      Hue — emeralds run from yellow-green to blue-green. The most prized color is a pure, vivid green with neither modifier dominating.

•      Tone — emeralds need to be medium to dark in tone. Light-toned green beryls are not classified as emeralds at all.

•      Saturation — vivid, pure saturation is preferred over washed-out or grayish stones.

A general principle: when in doubt, prioritize color saturation over size or clarity. A small, beautifully colored emerald reads as a finer piece than a larger, paler one.

Clarity and the "Jardin"

Unlike diamonds, where inclusions reduce value, emeralds are expected to have inclusions. The trade calls these the "jardin" — French for garden — and they’re often considered marks of authenticity. The GIA classifies emerald as a Type III gemstone, meaning inclusions are expected in virtually all natural specimens. An emerald that looks completely flawless under a loupe should make you suspicious; it’s likely synthetic.

That said, not all inclusions are equal. Surface-reaching fractures are durability concerns, while well-distributed internal inclusions are aesthetic features. A skilled gemologist can read the difference.

Cut

The classic "emerald cut" — a rectangular step cut with cropped corners — was developed specifically for this stone. The cropped corners reduce stress at the most fragile points, and the broad table emphasizes color. Other cuts work, but emerald cuts remain the standard for higher-quality stones.

Carat

Large fine emeralds are genuinely rare. Prices climb steeply above two to three carats, especially for stones with strong color and minimal treatment. For most buyers, optimizing for color and cut at a reasonable carat weight produces a more beautiful piece than chasing size.

Origin

Origin matters more for emeralds than for almost any other gemstone:

•      Colombian emeralds — particularly from Muzo, Chivor, and Coscuez — are the historic standard, prized for their pure intense green. They often carry significant inclusions.

•      Zambian emeralds, primarily from the Kagem mines, tend toward bluish-green with better transparency and fewer inclusions.

•      Brazilian emeralds offer a range of colors and are often more accessible in price.

•      Afghan and Pakistani emeralds (notably Panjshir Valley) are rarer but can rival Colombian color quality.

Country-of-origin reports from GIA, Gübelin, or SSEF can be requested for stones of significant value.

Treatment

Almost every commercial emerald on the market has been treated. The most common treatment is oiling — traditionally with cedar oil — which fills surface-reaching fractures and improves clarity. This has been industry practice for centuries and is fully accepted, but the degree of treatment matters. Treatment is graded on a scale of none, minor, moderate, and significant. "No oil" stones command a major premium. Reputable jewelers will disclose treatment status; stones marketed without treatment information should be approached cautiously.

Alternative May Birthstones

While the emerald is the modern May birthstone, alternatives exist for those who want the green color without the cost or fragility:

•      Chrysoprase — a vivid apple-green chalcedony (Mohs 6.5–7), sometimes listed as a traditional May alternative. More durable in toughness terms than emerald and significantly more affordable.

•      Green tourmaline — a saturated green stone (Mohs 7–7.5) that pairs beautifully with diamond accents and offers more durability than emerald for daily wear.

•      Tsavorite garnet — a vivid green grossular garnet (Mohs 6.5–7.5) that rivals emerald’s color and is generally untreated and cleaner internally.

•      Lab-grown emeralds — chemically and optically identical to mined emeralds, available at significantly lower cost. First commercially produced by Carroll Chatham in the 1960s.

Each of these has a different appearance and character. Green tourmaline and tsavorite are often better choices for daily-wear rings; chrysoprase suits more casual or organic designs.

Choosing an Emerald in Hawaii

Buying a fine emerald in Hawaii has the same general considerations as buying a fine diamond — limited local inventory, high importance of working with a jeweler with strong sourcing relationships — but the stakes of getting the evaluation right are higher. With emeralds, the differences between stones at similar price points can be dramatic, and the cost of a poor purchase is much higher.

At Jewel Box Hawaii, we work with vetted suppliers and a curated catalog of certified emeralds, with full disclosure of origin and treatment status on every stone. We encourage clients to inspect emeralds in person under proper lighting — emerald color shifts noticeably under different light sources, and seeing a stone outside its catalog photograph is essential.

Caring for Emerald Jewelry — Especially in the Islands

Emeralds require more careful handling than any of the other classic precious gemstones. They rate 7.5–8 on the Mohs scale — hard enough to resist most scratching — but their toughness is poor due to internal inclusions, which means they can chip or fracture from impact. Their oil treatment also requires specific care:

•      Never use ultrasonic or steam cleaners on emerald jewelry. Both will strip the oil treatment and can cause inclusions to fracture further. This is the single most important rule.

•      Avoid harsh chemicals — household cleaners, chlorine, acetone. Remove emerald jewelry before cleaning, swimming in pools, or applying chemical products like nail polish remover.

•      Remove emerald rings before swimming in the ocean. Salt water accelerates the breakdown of the oil treatment, and the impact risk from waves and rocks is real.

•      Clean gently. Warm water, very mild dish soap, and a soft cloth. No brushing.

•      Avoid sudden temperature changes. Going directly from a cold air-conditioned room to outdoor heat can stress an oil-treated stone.

•      Plan for periodic re-oiling. Depending on wear, an emerald may benefit from professional re-oiling every five to ten years to restore the original treatment.

The combination of saltwater, sunscreen, and sand makes Hawaii’s environment particularly tough on emerald jewelry. We offer professional cleaning and re-oiling as part of our restoration and heirloom care services — it’s a service most casual jewelry owners don’t realize exists, and it makes a meaningful difference in the lifespan of a fine emerald piece.

Gift Ideas for a May Birthday

If you’re shopping for someone with a May birthday, a few directions worth considering:

•      Emerald earrings or a pendant — these are the most practical entry points for emerald jewelry. They face less impact stress than rings and don’t require the level of daily attention that a ring would.

•      A custom-designed piece featuring an emerald accent — a smaller emerald paired with diamond or other accent stones in a protective setting. We routinely design pieces around an existing or newly sourced emerald.

•      An Aloha Pauahi heirloom bracelet with an emerald accent — for someone with deep Hawaiian roots, the Aloha Pauahi line offers a way to celebrate cultural heritage alongside the personal milestone of a May birthday.

Schedule a Consultation

Whether you’re choosing an emerald for a milestone, designing a piece around a May birthday, or restoring an heirloom emerald that’s already in the family, we’d be glad to help. Browse our gemstone inventory or schedule a consultation to start a conversation.