The Emerald Cut: The History and Art of an Iconic Cut
The emerald cut is a rectangular cut with beveled sides and parallel, step-cut facets. It was developed in the16th century to cut emeralds while minimizing pressure on the stone and reducing the risk of chipping at the corners. The name has stuck.
First applied to diamonds in the 1920s, it has become one of the most recognizable cuts. It does not produce fire like the brilliant cut, but offers a unique visual effect called the “hall of mirrors”—a series of parallel reflections reminiscent of mirrors facing each other. It prioritizes clarity and geometry over brilliance.
When we talk about the “emerald cut” today, we’re often referring to a diamond. It’s a paradox: this cut was invented for emeralds, but it has become one of the signature cuts for diamonds, popularized by Art Deco engagement rings and adopted by stars like Beyoncé, Jennifer Lopez, and Amal Clooney. To understand how a cut designed for a green stone became iconic on a clear diamond, we need to go back to its origins.
The Origin: Why This Cut for the Emerald
The emerald is a fragile gemstone. Its hardness is adequate (between 7.5 and 8 on the Mohs scale), but its toughness is low due to its natural inclusions. A single misplaced pressure during cutting can cause a stone—which gem cutters have spent weeks preparing—to shatter.
In the 16th century, gem cutters in Antwerp and Amsterdam developed a cut specifically designed to address this challenge. The idea was simple: to avoid sharp points and corners, which are the areas where impact energy is concentrated. By cutting the four corners of the rectangle to form bevels, they created a stone that was more durable when worn and easier to set.
Thestep-cut design follows the same principle. Rather than creating numerous small triangular facets, as in a brilliant-cut diamond, long facets are cut parallel to the sides. This reduces the number of edges and thus the risk of a fracture propagating in the event of an impact.
This cut has become the standard cut for emeralds. So much so that its name has entered everyday language: it is called the “emerald cut” even when applied to other gemstones.
The Anatomy of the Emerald Cut
A classic emerald cut has several specific characteristics.
General Form
A rectangle with all four corners cut to form bevels (chamfered corners). The length-to-width ratio is generally between 1.3 and 1.5 for classic proportions. Above 1.5, the stone becomes elongated and resembles a baguette. Below 1.3, it resembles the Asscher cut (square with beveled corners).
Veneers
An emerald cut typically has 57 or 58 facets, including:
- A flat, wide rectangular table in the center
- Three rows of stepped facets on the crown (above the rondiste)
- Three rows of stepped facets on the cylinder head (below the cylinder head gasket)
- Facets with beveled corners, which finish off the stone
The table
The table of an emerald-cut diamond is about 60 to 70 percent of the stone's width, which is much larger than that of a round brilliant cut. This large table is what makes the stone appear larger for the same carat weight and creates its characteristic depth effect.
The Adoption of the Diamond in the20th Century
The emerald cut as applied to diamonds is essentially a 20th-century phenomenon. For centuries, diamonds were cut primarily into rose, old brilliant, or navette shapes. The emerald cut came along relatively late.
The turning point came in the 1920s, at the height of the Art Deco period. The Art Deco movement emphasized pure geometric lines, rectangles, and sharp angles. The emerald cut, with its clean geometry, became the perfect expression of this aesthetic. Cartier, Van Cleef & Arpels, and Boucheron made it a signature feature of their cocktail and engagement rings.
The emerald cut for diamonds was officially standardized in 1940, at the initiative of the diamond industry. The proportions were then established, and the cut was included in technical catalogs alongside the round brilliant cut.
Since the 2010s, the emerald cut has seen a strong resurgence in popularity. There are several reasons for this: a return to Art Deco styles, the popularity of celebrity rings (Beyoncé, Amal Clooney, and Jennifer Lopez all wear emerald-cut diamonds), and a public seeking an alternative to the classic round brilliant cut.
The "hall of mirrors" visual effect
An emerald-cut diamond does not sparkle like a round brilliant. Whereas the round brilliant produces fire—those fleeting bursts of color that are triggered by the slightest movement—the emerald cut produces an effect known as the “hall of mirrors.”
The effect comes from the parallel, stepped facets. When light enters the stone, it reflects off these parallel surfaces as if between two mirrors facing each other. We then see a series of rectangular reflections that seem to recede into the stone, like an infinite sequence.
This effect is most noticeable in diamonds of very high clarity. For this reason, an emerald cut generally requires a higher clarity grade than an equivalent round brilliant cut: the large table and step facets do not conceal inclusions, which remain highly visible. In a round brilliant cut, inclusions are often concealed by the sparkle; in an emerald cut, they are exposed.
Pros and Cons of the Emerald Cut
Benefits
- Greater visual impact for the same weight. An emerald cut appears about 5 to 10 percent larger than a round brilliant cut of the same weight, thanks to its large table.
- A simple, elegant design. Clean lines and pure geometry—ideal for those who don't like overly flashy designs.
- This stone is more durable when worn thanks to its beveled edges (no fragile corners).
- A "hall of mirrors" effect that is unique among faceted cuts.
- A strong trend over the past ten years: resale value has been more stable than that of other, less popular sizes.
Disadvantages
- Zero tolerance for clarity. An emerald cut ideally requires a diamond with VS1 clarity or higher. Inclusions are very visible through the large table.
- Low color tolerance. Yellow or brown hues are more noticeable in a diamond than in a round brilliant cut. You should aim for at least a G color grade or higher.
- Less fire and sparkle. If the goal is to have a stone that “explodes” with light, the emerald cut is not the right choice.
- Greater material loss at the waist on a rough-cut piece that is not properly shaped.
Comparison with Other Sizes
| Criterion | Emerald cut | Princess cut | Round gemstone |
|---|---|---|---|
| Form | Rectangle with cut corners | Square with sharp corners | Round |
| Types of Veneers | Stepped (step cut) | Brilliant | Brilliant |
| Main visual effect | Hall of Mirrors, Depth | Bright Sparkle | Maximum Fire and Sparkle |
| Number of facets | 57–58 | 57–76 | 57–58 |
| Apparent size at equal weight | Largest | Smaller | Reference |
| Requirement for Clarity | Very high | Average | Allows more inclusions |
| Durability during wear | Excellent (beveled edges) | Low (vulnerable areas) | Good |
| Price per carat (for diamonds of equal quality) | 10–15% smaller than the round one | 20–30% smaller than the round one | The most expensive |
How to Choose an Emerald-Cut Diamond
Here are the criteria to look for in an emerald-cut diamond.
Clarity
Aim for at least VS1, ideally VVS2 or VS1. Below VS1, inclusions generally become visible to the naked eye through the large table. For a long-term investment, do not go below VS1.
Color
Aim for at least G, ideally F or E. The large table makes yellowish hues more noticeable than on a round brilliant cut. An H or I color may seem acceptable on a round brilliant cut but will appear yellowish on an emerald cut.
Proportions
The length-to-width ratio is a matter of personal taste:
- 1.30 to 1.40: “classic,” well-balanced emerald cut
- 1.40 to 1.50: "elongated" emerald cut, more modern
- Over 1.50: the stone tends toward a baguette cut
Carat
The emerald cut is particularly flattering for diamonds over 1 carat. For smaller stones, the “hall of mirrors” effect and the overall geometry are less noticeable. If you’re on a tight budget, it’s better to choose a 1.2-carat emerald cut diamond with VS1 clarity than a 1.8-carat emerald cut diamond with SI2 clarity.
Polish and Symmetry
On an emerald cut, the polish (quality of the polish) and symmetry (alignment of the facets) are visible to the naked eye. Any irregularities are immediately apparent. Aim for an “Excellent” grade—or at least “Very Good”—on both of these criteria.
Are you looking to learn more about gemstones before you buy?
At Johya, every stone we offer comes with detailed documentation: origin, dealer, and certificate. We regularly publish educational guides on gemology and the emerald market.
Frequently Asked Questions
Why is this cut called the “emerald cut” when it’s used for diamonds?
Because it was invented inthe 16th century to cut emeralds, minimizing the risk of chipping a fragile stone. The name stuck when the cut was adopted for diamonds in the 1920s, during the Art Deco era. Today, it is used for diamonds, sapphires, rubies, aquamarines, and many other gemstones.
Is an emerald-cut diamond less expensive than a round brilliant?
Yes, generally speaking. For diamonds of equal quality (same 4Cs), an emerald-cut diamond costs about 10 to 15 percent less than a round brilliant cut. This is because there has historically been stronger demand for the round brilliant cut, and the loss of material during cutting is more predictable for that cut.
What is the minimum clarity grade for an emerald-cut diamond?
VS1 minimum. The large table and stepped facets make the inclusions very visible. Below VS1, the inclusions become visible to the naked eye. For a good balance between quality and price, VS1 to VVS2 is the ideal range.
Is the emerald cut suitable for everyday wear?
Yes, better than most other cuts. The beveled edges, rather than sharp corners, make the stone more resistant to impact. That’s why it was originally invented. An emerald-cut engagement ring is a solid choice for everyday wear.
What is the difference between an emerald cut and an Asscher cut?
Both are step cuts with beveled facets. The difference lies in their shape: the emerald cut is rectangular (with a ratio greater than 1.2), while the Asscher cut is square (with a ratio close to 1.0). The Asscher cut also has deeper proportions and a smaller table, which creates a more pronounced “well” effect.
Can an emerald be cut into an emerald cut?
Yes, it is actually the most common cut for emeralds—the one for which it was originally designed. Most faceted emeralds on the market are cut in the emerald cut, oval cut, or cushion cut. The choice depends on the shape of the rough stone and the quality of its inclusions.
Source cited. For official standards and cut classifications, see the Gemological Institute of America’s Diamond Size Guide.