Green Emerald Guide

Colour usually has the greatest influence on an emerald's beauty and value.

When assessing emerald colour, it helps to understand three characteristics:

Hue - the actual colour, such as pure green or slightly bluish green.

Tone - how light or dark the emerald appears.

Saturation - the strength or intensity of its colour.

Highly desirable emeralds generally display a strong green to bluish-green colour with good saturation, but darker doesn't automatically mean better.

If an emerald becomes too dark, it can lose brightness and appear almost black in certain lighting. Likewise, a slightly lighter emerald with vivid saturation can sometimes be considerably more attractive than a darker stone with dull colour.

Natural emeralds are commonly included - considerably more so than many other gemstones.

These internal characteristics are often referred to as an emerald's jardin, from the French word for garden, because some can create branching or moss-like patterns inside the stone.

Their presence isn't automatically a problem.

What matters is where the inclusions are, how visible they are and whether they affect the emerald's transparency, beauty or durability.

We'd be more cautious about significant fractures or inclusions that reach vulnerable areas of the stone than small internal characteristics that simply form part of its appearance.

An emerald's cut influences its colour, brightness, visible size and durability.

The rectangular step cut now known as the emerald cut was developed with emeralds in mind. Its cut corners can help protect vulnerable points, while its broad step facets showcase the stone's colour and internal character.

But an emerald doesn't need to be emerald cut.

Emeralds can also be found in oval, cushion, pear, round and other shapes, and each can interact with colour differently.

Depth and proportions matter too. A poorly proportioned emerald may appear unnecessarily dark or lose brightness through the stone.

Carat measures weight, not visible size.

Two emeralds of identical carat weight can look noticeably different in size depending on their shape, dimensions and depth.

Larger fine-quality emeralds become increasingly rare, but we'd generally rather choose a smaller emerald with exceptional colour and an attractive overall appearance than prioritise carat weight at the expense of beauty.

Colombia has been one of the world's most important sources of fine emeralds for centuries, with Muzo, Coscuez and Chivor among its best-known mining areas.

Fergus James primarily sources natural Colombian emeralds, with a particular focus on stones from the Muzo region in Boyacá.

Muzo is one of the world's most famous historic emerald-producing areas and has become particularly associated with rich, deeply saturated green emeralds.

Stones from the area are often prized for a distinctive, intense green appearance - what we'd describe as a beautiful evergreen hue.

Different Colombian mining areas can produce subtly different appearances. Muzo is generally associated with darker tones of pure green, while emeralds from Chivor can lean towards a lighter, slightly bluish green.

However, these are tendencies rather than guarantees. Every mine can produce emeralds across a range of colours and qualities.

Not automatically.

Muzo carries considerable prestige because of its history and the exceptional emeralds the region has produced, and provenance can influence the rarity and value of an important stone.

But we'd never recommend an emerald simply because Muzo appears on an origin report.

Colour, transparency, treatment, inclusions and the overall beauty of the individual emerald still matter most.

For significant natural emeralds, a specialist gemological laboratory may also provide an opinion on geographic origin.

Forms through geological processes within the Earth and is valued partly for its natural origin and rarity.

Created in controlled conditions and has essentially the same chemical composition, crystal structure and physical properties as its natural counterpart.

The fundamental difference is origin and rarity.

Some buyers value the rarity and natural formation of mined emeralds, while lab-grown emeralds can provide a similar type of appearance at a very different price point.

Neither should be confused with an emerald simulant, which is a different material made to resemble emerald.

Creates a warm, traditional contrast with green.

Create a cooler appearance that keeps more visual attention on the emerald.

Creates a softer and more unusual colour combination.