May Birthstone Emerald: How to Choose One With Confidence
Updated: Sep 22
Emerald is May’s birthstone, but it is also one of the most easily misunderstood coloured gemstones.
The right emerald can appear almost alive, with a rich green colour that draws you in. However, two emeralds of a similar size can differ enormously in beauty, durability and value. Colour, transparency, inclusions, clarity enhancement, origin and the quality of the accompanying documentation all matter.
If you are choosing an emerald for a birthday, anniversary, engagement ring or personal collection, here is what you need to understand before you buy.
What Is May’s Birthstone?
Emerald is the traditional birthstone for May and the gemstone associated with both the twentieth and thirty-fifth wedding anniversaries.
It is the green variety of the mineral beryl, the same mineral family that includes aquamarine and morganite. To be described as emerald rather than green beryl, the colour must fall within an accepted range from green to bluish green, although laboratories and gemmologists do not always agree on where the boundary lies.
Emerald has long been associated with spring, renewal, love and abundance. These meanings belong to its cultural history and symbolism rather than scientifically established properties.
What Makes an Emerald Valuable?
Emerald quality cannot be judged by carat weight alone. Colour is usually the most influential factor, but transparency, clarity, treatment, cut and durability must all be considered together.
Colour
The most desirable emeralds generally display a vivid green to bluish-green colour with strong saturation. The tone should be neither so light that the stone resembles green beryl nor so dark that its colour and internal life disappear.
Look at the emerald under neutral daylight as well as indoor lighting. Jewellery-shop spotlights can make a stone look considerably brighter and more saturated than it will appear in normal surroundings.
Colour should also be reasonably even across the stone. Obvious pale areas, very dark areas or distracting colour zoning can affect both its appearance and value.
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Clarity and transparency
Natural emeralds commonly contain inclusions. Their mossy or garden-like appearance is sometimes described using the French word jardin.
The presence of inclusions does not automatically make an emerald undesirable. In fact, a completely clean-looking natural emerald should be examined particularly carefully because eye-clean natural emeralds are unusual and can command substantial prices.
What matters is how the inclusions affect transparency, beauty and durability. Large fractures, particularly those reaching the surface or extending towards the corners, may make an emerald more vulnerable to damage.
Cut
The familiar rectangular emerald cut was developed partly to protect vulnerable corners while making the most of the stone’s colour.
Whatever the shape, look for a cut that distributes light and colour attractively. A poorly proportioned emerald may have a lifeless area or “window” through its centre, while an excessively deep stone can retain unnecessary weight without appearing larger from the front.
Carat weight
Larger fine-quality emeralds are increasingly rare, so prices can rise significantly with size. However, a large, heavily included or over-dark emerald is not automatically more valuable than a smaller stone with exceptional colour, transparency and cut.
Always compare quality before becoming distracted by the carat figure.
Does an Emerald’s Origin Matter?
Colombia, Zambia and Brazil are among the best-known sources of emeralds, but beautiful stones are also found elsewhere.
Colombian emeralds are often associated with warmer, intense greens, while Zambian material is frequently described as cooler or more bluish green. These descriptions are generalisations: the appearance of emeralds from different sources can overlap considerably.
Origin can influence rarity and market value, particularly for exceptional stones, but it should not be assumed from appearance or a seller’s description. For a significant purchase, any important origin claim should be supported by an opinion from a respected independent gemmological laboratory.
Ultimately, a famous origin does not compensate for weak colour, poor transparency or significant durability concerns.
Are Emeralds Treated?
Many natural emeralds contain surface-reaching fractures. These may be filled with oil, resin or another substance to reduce their visibility and improve the stone’s apparent clarity.
Clarity enhancement is common within the emerald trade, but the type and extent of that enhancement can influence value, stability and future care.
Before buying, ask:
Has the emerald received any clarity enhancement?
What substance was used?
Is the degree of enhancement minor, moderate or significant?
Has this information been recorded on the invoice?
Does an independent laboratory report support the seller’s description?
A laboratory report may identify whether an emerald is natural or laboratory-grown, comment on detectable enhancement and sometimes provide an opinion about geographic origin. It does not tell you whether the price is fair or whether the emerald is the right choice for you.
My gemstone certification guide explains what a laboratory report can, and cannot, confirm.
Natural, Laboratory-Grown or Imitation?
Laboratory-grown emerald has essentially the same chemical, physical and optical properties as natural emerald, but it is created in a controlled environment rather than formed within the earth.
It should always be clearly disclosed and priced accordingly.
Emerald may also be imitated using glass, composite material or other green gemstones. For anything beyond a modest purchase, do not rely solely on appearance or a shop-issued card. Request appropriate independent testing and written disclosure.
Can You Wear Emerald Jewellery Every Day?
Emerald measures approximately 7.5 to 8 on the Mohs scale, but hardness measures resistance to scratching, not resistance to breaking.
Because many emeralds contain fractures, they require more thoughtful wear than ruby or sapphire. An emerald can be used in a ring, including an engagement ring, but the stone, setting and wearer’s lifestyle must all be considered carefully.
A protective setting may be sensible for a particularly included stone. Remove emerald jewellery before sport, gardening, cleaning or any activity where it might receive a sharp knock.
Never place an emerald in an ultrasonic or steam cleaner unless a suitably qualified professional has confirmed that it is safe. Warm water, mild soap and a soft brush are usually the safest cleaning method. The GIA emerald care guide provides further guidance.
My Emerald Buying Checklist
Before committing to an emerald, I recommend checking:
Whether it is natural or laboratory-grown.
Whether the colour remains attractive in normal lighting.
How inclusions affect transparency and durability.
Whether clarity enhancement is present and properly disclosed.
Whether any claimed origin is supported by a respected laboratory.
Whether the cut creates obvious windowing or dark areas.
Whether the setting is suitable for the stone and how you intend to wear it.
Whether the price has been compared with genuinely comparable emeralds.
Whether all important representations are recorded in writing.
If you are unsure about the seller, read my guide to choosing a trustworthy gemstone dealer.
Choosing an Emerald That Feels Right
Technical information matters, but an emerald should also move you. The most expensive stone is not necessarily the one you will love wearing.
Take time to compare different shades, shapes and types of inclusions. Look at each stone away from intense shop lighting and do not let rarity claims or pressure to act quickly replace proper examination.
If you are considering a significant emerald purchase, my independent gemstone sourcing service can help you define what you want, compare suitable stones and examine the information supplied before you make your decision.
For a completely personal finished piece, you can also explore my custom gemstone jewellery service.
Frequently Asked Questions
Is emerald always May’s birthstone?
Yes. Emerald is the traditional birthstone for May. It is also associated with twentieth and thirty-fifth wedding anniversaries.
Are inclusions normal in emeralds?
Yes. Natural emeralds commonly contain visible inclusions. Their effect on transparency, appearance and durability matters more than their presence alone.
Is an oiled emerald still natural?
Yes. Clarity enhancement does not change a natural emerald into a synthetic stone, but the treatment and its extent should be disclosed because they can affect value and care.
Can emerald be worn in an engagement ring?
Yes, but emerald requires more care than ruby, sapphire or diamond. The individual stone’s fractures, setting and the wearer’s lifestyle should be assessed before deciding.
Information reviewed: September 2026.
Kim Rix GG GIA
Independent Gemstone Sourcing Specialist
Gemstone Detective
