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Emerald Cut Loose Diamonds
エメラルドカットダイヤモンドルース
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Natural Loose Natural Diamond 1.03ct Colorless D Square-Emerald
Regular price ¥880,000 (Tax incl.)Unit price per -
Sold outNatural Loose Natural Diamond 1.561ct Light Yellow S Emerald-cut
Regular price ¥490,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 1.004ct Colorless D Emerald-cut
Regular price ¥780,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 1.73ct Colorless D Emerald-cut
Regular price ¥2,960,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 2.017ct Colorless D Emerald-cut
Regular price ¥4,420,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 1.613ct Colorless E Emerald-cut
Regular price ¥1,570,000 (Tax incl.)Unit price perSold out
How to Choose an Emerald Cut Loose Diamond
What Makes Emerald Cut Fundamentally Different
The emerald cut is a step-cut shape — which places it in an entirely different category from round, cushion, oval, pear, and radiant, all of which are brilliant cuts. Where brilliant-cut shapes use dozens of triangular facets to scatter light in multiple directions simultaneously, emerald cut uses long, flat, rectangular step facets arranged in parallel rows above and below the stone's girdle. These facets function more like mirrors than prisms: rather than breaking light into sparkle, they reflect entire planes of light in shifting patterns as the stone moves — an effect known as the hall-of-mirrors. The result is a calm, architectural luminosity that is unlike anything a brilliant-cut shape produces. It is less about fire and scintillation, more about depth, clarity, and the cool transparency of the stone itself. This makes emerald cut particularly appealing to buyers who find brilliant-cut sparkle overstimulating, or who want a diamond that reads as more understated and elegant than the conventional solitaire. Buying emerald cut loose allows you to evaluate the stone's internal clarity and proportion directly before committing to a setting — which, for this shape more than any other, is the single most consequential decision.
Clarity First — Why Emerald Cut Changes the 4C Priority Order
For brilliant-cut shapes, cut grade or color typically dominates the selection decision, with clarity playing a supporting role — because brilliant facets scatter light effectively enough to camouflage most inclusions below SI1. Emerald cut reverses this hierarchy. The open table facet and wide step facets provide a transparent window into the stone's interior, making inclusions visible at clarity grades where they would be invisible in a round or cushion cut. This is why VS1 or above is the standard recommendation for emerald cut — not because lower clarity grades are generally unacceptable, but because the probability of eye-visible inclusions is meaningfully higher per clarity grade than it is for brilliant cuts. The practical implication: when allocating budget across the 4Cs for an emerald cut loose diamond, prioritize clarity first, then color, and allow cut and carat weight to be determined by what remains. For color, D through F is recommended for white gold and platinum settings — the open table face makes color easier to perceive than in brilliant cuts, particularly at the edges of the stone. Emerald cut also works exceptionally well for fancy color diamonds: the step facets concentrate and deepen color in a way that reads as particularly refined and intentional.
Square Emerald, Asscher Cut, and Proportion
Emerald cut comes in a range of length-to-width ratios that significantly affect its character. The classic elongated emerald cut falls between 1.30 and 1.50 in ratio — rectangular, with the hall-of-mirrors effect running along its length. A square emerald (ratio 1.00 to 1.10) produces a more compact, symmetrical face-up appearance often referred to as Asscher cut, after the Asscher Brothers who developed a closely related step-cut square shape in the early 20th century. Square emerald cuts have a stronger geometric presence and produce a different version of the hall-of-mirrors effect — one that radiates outward from the center rather than running along a longer axis. Both are in our collection. Setting recommendations for either proportion: a simple four-prong solitaire in platinum or white gold allows the stone's clarity and the hall-of-mirrors effect to be appreciated fully without visual competition from the setting. Bezel settings offer more protection but reduce the light entering from the sides. Contact us to discuss your preferred proportion or arrange a viewing. Browse finished emerald cut rings at our emerald cut diamond ring collection.
Frequently Asked Questions
An emerald cut diamond is a step-cut shape with a rectangular outline and long, flat, parallel facets that produce a hall-of-mirrors effect — planes of light shifting in patterns rather than the scattered sparkle of brilliant cuts. It is calmer, more architectural, and more transparent than any brilliant-cut shape. The open table makes clarity directly visible, making emerald cut the shape most sensitive to clarity grade among all diamond shapes.
Emerald cut's step facets and open table provide a transparent window into the stone's interior. Unlike brilliant-cut shapes, which scatter light enough to camouflage most inclusions, emerald cut's flat facets show inclusions clearly. VS1 or above is the standard recommendation, as the probability of eye-visible inclusions increases per clarity grade more steeply than in brilliant cuts. Viewing the stone in person is the most reliable way to assess clarity before purchasing.
The hall-of-mirrors effect is the distinctive light behavior of step-cut diamonds like emerald cut. The long, flat, parallel facets reflect entire planes of light in shifting alternating dark and light patterns as the stone moves — creating a depth and calm luminosity unlike the scattered multi-point sparkle of brilliant cuts. It is the defining visual characteristic of emerald cut and the main reason buyers choose this shape over brilliant alternatives.
Both are step-cut shapes with the same facet structure and hall-of-mirrors effect. The difference is proportion: a standard emerald cut has a rectangular length-to-width ratio of 1.30 to 1.50. A square emerald (ratio 1.00 to 1.10) is square or near-square, producing a more symmetrical face-up appearance often called Asscher cut. Square emerald produces a version of the hall-of-mirrors effect that radiates outward from the center rather than running along a longer axis.
D through F is recommended for emerald cut in white gold or platinum settings. The open table makes color more perceptible than in brilliant cuts, particularly at the edges of the stone. In yellow gold settings, G through H can appear natural and attractive. Emerald cut also suits fancy color diamonds very well — the step facets concentrate and deepen color in a refined, intentional way.
Yes. All emerald cut loose diamonds at Weiss carry GIA or CGL certification, documenting color grade, clarity, carat weight, and symmetry. Clarity grade is the most important data point on the certificate for emerald cut, but must be combined with in-person viewing to assess the actual visibility of inclusions in the stone's interior.
Yes — and for emerald cut in particular, in-person viewing is strongly recommended. The hall-of-mirrors effect and the actual clarity of the stone's interior can only be properly assessed by viewing it directly in natural light. Certificate data alone cannot convey how the stone's step facets handle light in practice. Our appointment-only office is in Okachimachi, Tokyo. Please book an appointment through our contact page or by phone.
Prefer a finished piece? See our Emerald cut Diamond Rings.