EMERALDS IN JEWELRY

KEY CHARACTERISTICS OF THE EMERALD
 

Like aquamarine, the emerald belongs to the beryl family; the two stones can be considered cousins. Its main characteristics are:

 

1. A miraculous existence
 

Emeralds are stones that, theoretically, shouldn't exist. Their formation results from the combination of two elements that are usually incompatible: chromium and beryllium. Beryllium provides the stone's structure, while chromium—along with vanadium and sometimes iron—gives it its signature green color.

Emeralds require extremely specific—almost miraculous—geological, temperature, and pressure conditions to form, which is what makes them such exceptional stones!

 

2. The stone that gave its name to a color
 

The green of an emerald is deep and balanced, sometimes with hints of blue... it is truly unique.
 

This color is so distinctive that the emerald has lent its name to a specific hue. "Emerald green" is an official, recognized color used across many fields.

 

3. Relative fragility
 

With a rating of 7.5/10 on the Mohs scale, the emerald is the softest—and therefore the most fragile—of the precious stones. It cannot be handled in the same way as a diamond or corundum (sapphire or ruby), which rate 10/10 and 9/10 respectively on the same scale.
 

Rest assured, "fragile" doesn't mean the emerald will crumble the moment it is touched! While perfectly suitable for jewelry, it simply requires a bit more care and, above all, vigilance to avoid impacts.
 

Where does this fragility come from?
 

The emerald is a stone that naturally contains visible inclusions—as do many other natural gemstones.

Inclusions refer to the presence of various foreign elements that became trapped inside the stone during its formation.
 

What do emerald inclusions look like?
 

Resembling a white veil within the stone, these inclusions are commonly known as "frost" or "feathers"; in the case of emeralds, they are poetically referred to as the stone's "garden." This is entirely normal and actually contributes to the unique character of each stone—acting much like a fingerprint. Every emerald possesses its own specific inclusions, making each one unique.
 

Because emeralds naturally contain many inclusions, they require treatment to strengthen them and make them more suitable for use in jewelry.
 

What does this treatment involve?
 

The traditional treatment for emeralds is a cedar oil bath. This oil is a natural, colorless, viscous, and highly adhesive substance that seeps into the stone's microscopic fissures, thereby increasing its durability.

Global gemological organizations consider this technique a natural and legitimate process. It does not negatively affect the emerald's price or value—quite the opposite!
 

Note: Due to its unique structure, the emerald is one of the few natural colored gemstones that is not heat-treated. It simply would not withstand such treatment, as emeralds do not react well to heat...

Beyond these characteristics, the emerald is also renowned for its quality. What defines that quality?

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EMERALD QUALITY
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The highest grade for a colored gemstone is AAA quality.

Unlike diamonds, colored gemstones lack a standardized, internationally recognized system for comparison.

That said, the certification process for a colored gemstone—such as an emerald—is just as rigorous as that for a diamond and is based on three quality levels:

• A: denotes average, common quality.

• AA: denotes a rarer quality, typically used by small local lapidaries rather than major retailers. It represents superior quality with few flaws and rich, vibrant colors.

• AAA: the highest possible quality for colored gemstones. It signifies a complete absence of flaws, superior brilliance, and rich, uniform color.

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How is this quality assessed for a ruby?

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It is based directly on the universal "4Cs" used for diamond certification!
Namely:

• Color: whether it is natural or enhanced by treatment,

• Weight: the stone's carat weight,

• Cut (or faceting): an assessment of the quality of the stone's faceting and its shape,

• Clarity: the presence or absence of inclusions visible to the naked eye or under 10x magnification.