Asscher Cut Diamond Engagement Rings

Asscher cut diamond engagement rings are for people who want something quieter, more deliberate, and more architectural than a brilliant cut. The Asscher cut is a square step cut with cropped corners, producing the same hall-of-mirrors lustre as an emerald cut but in a compact, symmetrical square. Where brilliant cuts flash and sparkle, the Asscher cut draws you in. Its concentric facets create a mesmerising pattern of light and dark that pulls the eye deep into the centre of the stone.

Every Asscher cut engagement ring in our collection is handcrafted individually in platinum or 18ct gold, set with a certified lab-grown or natural diamond. Browse our designs below and use the configurator to see live pricing for your preferred metal and carat weight.

The History of the Asscher Cut

The Asscher cut was created in 1902 by Joseph Asscher of the Royal Asscher Diamond Company in Amsterdam, one of the most prestigious diamond cutting houses in the world. The Asscher family were already famous. In 1908, Joseph Asscher was entrusted with cleaving the Cullinan Diamond, the largest gem-quality rough diamond ever found, which yielded stones that now sit in the British Crown Jewels.

The original Asscher cut was a square step cut with a distinctive high crown and small table, designed to maximise the stone’s lustre and depth rather than its sparkle. It became one of the defining diamond shapes of the Art Deco period, prized for its clean geometry and quiet sophistication. In 2001, the Royal Asscher Diamond Company introduced a modernised version with additional facets for improved light performance, now known as the Royal Asscher cut. Both versions remain in use today, though the classic 58-facet Asscher is the one most commonly found in engagement rings.

Why Choose an Asscher Cut Engagement Ring?

The Asscher cut offers something that no brilliant cut can. Its step-cut facets run in long, parallel lines like a staircase, producing broad, dramatic flashes of light and dark contrast rather than the rapid scintillation of a round or oval. The optical effect is often described as a hall of mirrors or an endless corridor, and it gives the Asscher cut a depth and intensity that brilliant cuts do not possess.

The square shape with cropped corners creates a distinctive octagonal outline that sits beautifully in both contemporary and vintage settings. It is a compact shape that does not elongate or widen the finger but instead sits neatly and symmetrically, making it one of the most balanced diamond shapes on the hand.

The Asscher cut also has a strong association with Art Deco design, which makes it a natural partner for vintage and geometric settings. But it works equally well in modern, minimalist designs where the stone’s calm lustre can speak for itself without competing with elaborate metalwork.

Asscher Cut vs Emerald Cut: What Is the Difference?

The Asscher cut and the emerald cut are siblings. Both are step cuts with cropped corners and the same hall-of-mirrors light performance. The difference is proportion. The emerald cut is rectangular, typically with a length-to-width ratio of 1.40 to 1.55. The Asscher cut is square, with a ratio of 1.00 to 1.05.

The Asscher cut also tends to have a higher crown and a smaller table than the emerald cut, which gives it a slightly different optical character. Where the emerald cut’s long, open facets produce broad, horizontal flashes, the Asscher cut’s more compact geometry creates a concentric, almost hypnotic pattern that draws the eye inward toward the centre of the stone. If you prefer an elongated shape, the emerald cut is your stone. If you prefer a square with more depth and intensity, the Asscher cut is the answer.

What to Look For in an Asscher Cut Diamond

The Asscher cut is classified as a fancy shape by the GIA, which means it does not receive a formal cut grade on its diamond report. Choosing an Asscher cut diamond ring requires careful visual assessment. Here is what matters most.

Squareness is essential. A well-cut Asscher should appear perfectly square from above, with a length-to-width ratio between 1.00 and 1.05. Any ratio above 1.05 starts to look rectangular and loses the Asscher cut’s signature symmetry.

Windowing is the biggest risk with step cuts. Because the facets are large and open, a poorly proportioned Asscher cut can show a visible “window” through the centre of the stone where light passes straight through rather than reflecting back. This appears as a dull, transparent area in the middle of the diamond. We check every Asscher cut for windowing and reject any stone that shows it.

Clarity matters more in an Asscher cut than in most other shapes. The open, transparent facets hide very little, so inclusions that would be invisible in a round brilliant can be visible in an Asscher cut. We recommend VS2 or above for an eye-clean stone. All our lab-grown Asscher cut diamonds are graded to D-E colour, VS1-VVS1 clarity.

Colour is also more visible in step cuts. The Asscher cut’s open facets can show body colour more readily than brilliant cuts, particularly in the corners. We recommend D to F colour for the cleanest appearance.

Corner size should be balanced. The cropped corners give the Asscher cut its octagonal outline, and their size affects the stone’s overall character. Corners that are too large make the stone look more like a rounded square. Corners that are too small reduce the protection they provide and can make the stone appear sharp and angular. The right balance is subtle, and it is something we assess as part of our evaluation of every Asscher cut diamond.

Asscher Cut Diamond Sizes: What to Expect

The Asscher cut’s square shape and relatively deep pavilion mean that it carries more weight in its depth than some other shapes. Face-up measurements will be slightly smaller than a round of the same carat weight, but the square outline and concentric facet pattern give the stone a distinctive visual presence.

1 carat Asscher cut diamond measures approximately 5.5 x 5.5mm. A refined, elegant size that showcases the step-cut lustre beautifully in any setting.

1.5 carat Asscher cut diamond measures approximately 6.2 x 6.2mm. At this size, the hall-of-mirrors effect becomes truly captivating. A 1.5 carat Asscher cut engagement ring is an increasingly popular choice with lab-grown diamonds.

2 carat Asscher cut diamond measures approximately 6.8 x 6.8mm. The concentric light pattern and depth of the Asscher cut are at their most impressive at this size. A 2 carat Asscher cut diamond ring is one of our most striking configurations.

3 carat Asscher cut diamond measures approximately 7.8 x 7.8mm. A statement size that commands attention. We source 3 carat Asscher cut diamonds to order. Contact us for availability and pricing.

4 carat Asscher cut diamond measures approximately 8.5 x 8.5mm. With lab-grown Asscher cut engagement rings, a 4 carat stone has become achievable for many customers. Contact us to discuss.

Certification: Lab-Grown and Natural Asscher Cut Diamonds

Every natural diamond we set in our Asscher cut engagement rings is certified by the Gemological Institute of America (GIA), the world’s most respected independent grading authority. Our lab-grown Asscher cut diamonds are certified by either the GIA or the International Gemological Institute (IGI), both of which provide an objective assessment of the diamond’s colour, clarity, and carat weight, along with a unique report number that can be verified online.

Lab-grown Asscher cut diamonds are chemically, optically, and physically identical to natural diamonds. They are graded to the same standards and display the same lustre and light performance. The difference is origin, grown in a controlled environment rather than mined from the earth, and price, with lab-grown diamonds typically offering significantly more size and quality for your budget.

Natural Asscher cut diamonds carry the romance of geological rarity, each one formed over billions of years deep within the earth. Because the Asscher cut’s open facets show more of the stone’s character than brilliant cuts, we take particular care sourcing natural Asscher diamonds, evaluating clarity, colour, and proportions in person before presenting the stone to you. Contact us to discuss natural diamond options.

Our Asscher Cut Engagement Ring Styles

Each design in our collection is available with an Asscher cut diamond. Whether you prefer the clean symmetry of an Asscher cut solitaire, the subtle detail of a hidden halo, the added sparkle of a halo, the geometric elegance of a three stone Asscher cut ring, or the character of a vintage Asscher cut engagement ring, you can configure any of our rings with an Asscher centre stone. Select a design above to start building your ring, or book a consultation to discuss your perfect Asscher cut diamond engagement ring.

Is the Asscher cut the same as a square emerald cut?

They are closely related but not identical. Both are step cuts with cropped corners, but the Asscher cut typically has a higher crown and a smaller table than a square emerald cut, which gives it a deeper, more concentric light pattern. The Asscher cut was also designed as a square shape from the outset, while a “square emerald” is simply an emerald cut with a 1:1 length-to-width ratio. On a GIA certificate, a true Asscher cut will be described as “Square Emerald” or “Cut-Cornered Square Step Cut,” so the distinction is subtle but worth understanding.

How much does an Asscher cut engagement ring cost?

Our Asscher cut engagement rings start from around £1,500 for a lab-grown diamond in a solitaire setting. Price depends on your chosen carat weight, metal, and setting style. Asscher cut diamonds are generally comparable in price to emerald cuts and less expensive than round brilliants of the same carat weight. Use the configurator on any product page to see live pricing, or contact us for a natural diamond quote.

Does an Asscher cut diamond sparkle?

Not in the way a brilliant cut does. The Asscher cut is a step cut, so it produces broad, dramatic flashes of light and dark contrast rather than the rapid sparkle of a round brilliant. Many people find this calmer, more sophisticated light performance more captivating than conventional sparkle, particularly in candlelight and ambient lighting. If you want maximum scintillation, a brilliant cut is the better choice. If you want depth, lustre, and quiet drama, the Asscher cut is exceptional.

Why does clarity matter more in an Asscher cut?

The Asscher cut’s large, open step facets act like windows into the stone. Unlike a brilliant cut, where the many small facets scatter light and mask inclusions, the Asscher cut hides very little. An inclusion that would be invisible in a round diamond can be clearly visible in an Asscher cut. This is why we recommend VS2 clarity or above, and why we visually inspect every Asscher cut diamond before setting it.

What is the Royal Asscher cut?

The Royal Asscher cut is an updated version of the original Asscher cut, introduced in 2001 by the Royal Asscher Diamond Company. It features additional facets (74 versus the classic 58) and a higher crown, designed to improve light performance while retaining the step-cut character. The Royal Asscher is a patented cut available only through authorised retailers. The classic 58-facet Asscher cut remains the more widely available version and is the one most commonly used in engagement rings.

What is the difference between an Asscher cut and a princess cut?

Both are square diamond shapes, but they could not be more different in character. The princess cut is a brilliant cut, designed for maximum sparkle and fire. The Asscher cut is a step cut, designed for lustre and depth. The princess cut has sharp, pointed corners. The Asscher cut has cropped corners that give it an octagonal outline. If you want a square diamond that sparkles, choose the princess cut. If you want a square diamond with calm sophistication, choose the Asscher cut.

What metal suits an Asscher cut engagement ring best?

The Asscher cut looks stunning in every metal. Platinum and 18ct white gold give a sleek, contemporary feel that complements the stone’s clean geometry. Yellow gold adds warmth and a vintage Art Deco character that suits the Asscher cut’s heritage beautifully. Rose gold offers a romantic, modern contrast. All our Asscher cut rings are available in your choice of metal.

What is the difference between lab-grown and natural Asscher cut diamonds?

They are identical in every physical and optical property: same hardness, same lustre, same light performance. The difference is origin. Lab-grown diamonds are created in a controlled environment, natural diamonds are mined from the earth. Natural Asscher cut diamonds are GIA certified, while lab-grown are certified by either GIA or IGI. Lab-grown Asscher cut diamonds typically cost significantly less than natural equivalents of the same specification.