A Guide to Emeralds
Vivid Green • Rich History • May Birthstone
The word emerald derives from the Greek smaragdos, meaning green stone, and few gems have earned their name more completely. Emeralds are the most precious member of the beryl mineral family, coloured by traces of chromium or vanadium that produce their characteristic vivid green. They have been treasured across civilisations for thousands of years, from the Incas and Aztecs to the courts of Mughal emperors and European royalty. Today they remain one of the world's four precious gemstones and one of the most coveted stones in fine jewellery.
Where Do Emeralds Come From?
The most celebrated emerald deposits in the world are found in Colombia, Zambia and Brazil, each producing stones with their own distinctive character and colour signature.
Colombia
Colombian emeralds have been mined for centuries, originally by the indigenous Muzo people who traded them with the Mayans, Incas and Aztecs long before European contact. The Spanish introduced them to Europe around 1500 and Colombian stones have held the pinnacle of emerald prestige ever since, prized for their pure, slightly bluish green and exceptional transparency. Colombian origin, particularly from the Muzo or Chivor mines, commands the highest premium of any emerald source in the world.
Zambia
Zambian emeralds were discovered in 1928 but only became commercially significant from the late 1960s onwards. Today Zambia accounts for around 20% of global production and its stones are renowned for their deep, rich green with slightly bluish undertones. Zambian emeralds also tend to show generally superior clarity to many Colombian examples, making them an increasingly sought-after choice for fine jewellery.
Brazil
Brazilian emeralds tend toward a slightly yellower green and are often more included than Colombian or Zambian material. However fine examples are produced and they offer excellent value relative to stones from the two leading sources. Brazil has a long history of gemstone production and remains an important part of the global emerald supply.
The Jardin and Treatment
Unlike aquamarine, which is typically free from inclusions, emeralds almost always contain natural internal characteristics. These are not considered flaws but are celebrated as part of what makes each stone unique. The French word jardin, meaning garden, is used to describe the internal landscape of inclusions within an emerald, which can resemble mossy, plant-like formations when viewed under magnification.
The vast majority of emeralds on the market are treated with oil or resin filling to improve the appearance of surface-reaching fractures and enhance clarity. This is a widely accepted and long-established practice in the emerald trade. The degree of treatment, from none to significant, is documented by gemological laboratories and does affect value. Untreated emeralds of fine quality command a considerable premium.
When caring for emerald jewellery, always avoid ultrasonic cleaners and harsh chemicals, as these can strip the filling and make inclusions more visible. Clean with warm water and a soft brush instead.
What Determines the Price of an Emerald?
Emeralds are a precious gemstone and can command very significant prices, particularly at the finer end of the quality spectrum. Several factors combine to determine value.
1
Colour
Colour is the defining factor in emerald value. The most prized stones display a pure, vivid green or slightly bluish green with strong, even saturation. Stones that are too light, too dark, or carry yellowish or brownish overtones are considerably less valuable. Colombian material is often considered the benchmark for colour.
2
Clarity
Eye-clean emeralds are exceptionally rare and command a very significant premium. Unlike diamonds, emeralds are judged for clarity with the naked eye rather than under magnification. A stone with a lively, transparent appearance and minimal visible inclusions is far more valuable than a heavily included example, even if the colour is strong.
3
Cut
The classic emerald cut, a rectangular step cut with cropped corners, was specifically developed for this stone. It reduces stress on the gem, minimises the risk of chipping and allows the colour to display beautifully. Well-proportioned cutting that maximises colour and transparency adds meaningfully to a stone's value.
4
Carat Weight
Fine emeralds are rarer than diamonds of equivalent quality, particularly in larger sizes. Price per carat rises steeply as size increases, and a truly exceptional emerald of 3 carats or more with fine colour and clarity is among the most valuable stones in the world.
5
Origin
Colombian origin, particularly from the Muzo or Chivor mines, commands the highest premium and is documented by leading gemological laboratories. Zambian emeralds are increasingly recognised for their quality and offer exceptional value. Origin certification from an established laboratory adds meaningfully to a stone's provenance and price.
6
Treatment
The degree of oil or resin treatment significantly affects value. Untreated or minimally treated emeralds of fine quality are the rarest and most valuable. Heavily treated stones are more accessible but carry a lower intrinsic value. A reputable laboratory report will clearly disclose the degree of treatment present.
Emeralds in an Engagement Ring
Emeralds can make an extraordinarily beautiful choice for an engagement ring, but they require thoughtful consideration. With a hardness of 7.5 on the Mohs scale and the natural inclusions that most emeralds contain, they are more susceptible to chipping and surface damage than sapphires or rubies when worn daily.
A protective setting is essential. A bezel mount, a well-designed halo or a setting with protective claws that shield the corners of the stone will significantly reduce the risk of damage over time. With the right setting and a little care, an emerald engagement ring is a genuinely spectacular and deeply personal choice.
Quick Facts
Birthstone May
Anniversary 20th and 35th Year
Hardness 7.5 Mohs
Notable Sources Colombia, Zambia, Brazil
Gem Family Beryl
Signature Feature The Jardin
Why Choose Emerald Jewellery?
Few gemstones carry the history, cultural weight and sheer visual power of an emerald. Its vivid green has been associated with nature, renewal and prosperity across civilisations for millennia. To wear an emerald is to wear something with real meaning.
Each emerald is genuinely unique. The jardin within every stone creates an internal landscape that belongs to that stone alone, giving emerald jewellery a character and individuality that no other gem quite replicates. Fine emeralds are also genuinely rare, particularly in larger sizes and higher qualities, and they tend to hold their value exceptionally well over time.
Whether chosen as the May birthstone, an anniversary gift, an engagement ring or simply because its colour is like nothing else in the world, emerald jewellery is a choice that will always feel significant. At Cheshires, we would be delighted to help you find yours.
Discover Our Emerald Collection
At Cheshires, each emerald is hand-selected for colour, clarity and character. Visit us in store to view our curated selection, or book a personal appointment with our gemstone specialists.
