Asscher Cut Diamonds: The Art Deco Square and Why It Endures
The Asscher cut is among the most distinctive diamond shapes in fine jewellery. Its almost perfectly square outline, deeply cropped corners, and layered step-cut facets create an optical depth that is entirely different from the sparkle of brilliant-cut diamonds. It is a shape with genuine character, and it tends to attract buyers who value sophistication and historical resonance over maximum sparkle output.
History of the Asscher Cut
The Asscher cut was developed by the Royal Asscher Diamond Company in Amsterdam in 1902 and became closely associated with the Art Deco period of the 1920s and 1930s. Its geometric precision and angular character were perfectly aligned with the Art Deco movement’s love of symmetry, structure, and architectural form.
The original Asscher cut went largely out of fashion in the mid-twentieth century but was revived and redesigned in 2001 into what is now marketed as the Royal Asscher cut, with 74 facets compared with the original’s 58. The updated version produces better light performance while retaining the distinctive step-cut aesthetic.
How the Asscher Cut Differs from the Emerald Cut
The Asscher and emerald cut are both step cuts with parallel rows of facets and a large open table. The primary difference is shape: the emerald cut is rectangular, and the Asscher is square (or very nearly so, with a length-to-width ratio between 1.0 and 1.05).
The Asscher also has more deeply cropped corners than the emerald cut, producing an octagonal outline rather than a true rectangle with bevelled corners. When you look down through the table of a well-cut Asscher, the concentric squares of the facets create a visual tunnel or windmill pattern — one of the most striking visual effects in all of diamond cutting.
What to Look for in Clarity
Like all step cuts, the Asscher is unforgiving of clarity issues. The large, open facets act as mirrors rather than light-scattering elements, making inclusions significantly more visible than in brilliant-cut diamonds of equivalent clarity grades.
VS1 clarity or better is strongly recommended for Asscher cuts. VS2 can occasionally be eye-clean but should be verified in person. SI1 in an Asscher cut almost always shows inclusions to the naked eye and is generally not recommended for a centre stone that will be worn prominently.
Because the Asscher is rare relative to round brilliants and emerald cuts, finding a specific clarity grade in your preferred size may require patience. Working with a jeweller who can source specific stones on request is particularly valuable for Asscher cut buyers.
Colour Considerations
The open facet structure of the Asscher cut also shows body colour more clearly than brilliant cuts. G colour or above is recommended for Asscher cuts set in white gold or platinum settings. In yellow gold, H and I colour can be beautiful, as the warmth of the diamond and the warmth of the metal harmonise naturally.
The Windmill Effect
When viewed through the table, a well-cut Asscher diamond displays a pattern of concentric squares that appears as a windmill or tunnel. This effect is the most distinctive visual characteristic of the shape and one of the primary reasons buyers fall in love with it.
The windmill pattern is more pronounced and more symmetrical in well-cut stones. A poorly cut Asscher will show this pattern unevenly or with dark zones that interrupt the visual flow. Assessing this effect in person is one of the most important parts of selecting an Asscher cut diamond.
Setting Considerations
The cropped corners of the Asscher cut are less structurally vulnerable than the pointed corners of a princess cut but still benefit from corner prong protection. Four-prong settings that sit at the corners of the stone, rather than on the sides, are the most appropriate choice for an Asscher cut.
Solitaire settings suit the Asscher cut particularly well — the geometric precision of the cut is best displayed without distraction. Halo settings can work, but a square or octagonal halo that follows the Asscher’s outline is more harmonious than a round halo. Art Deco-inspired settings with milgrain detailing and geometric filigree complement the historical associations of the shape beautifully.
Asscher Cuts in Si Dian Zuan Sets
The Asscher cut suits Si Dian Zuan buyers who want their set to have a distinctive, considered aesthetic that stands apart from the more mainstream oval or round brilliant choices. It signals taste and intentionality.
The geometric, architectural character of an Asscher cut engagement ring calls for complementary Si Dian Zuan pieces with similar precision: clean lines, symmetrical settings, and a restrained palette that lets the diamonds speak for themselves rather than competing with elaborate metalwork.
Is the Asscher Cut Right for You?
The Asscher cut is for buyers who appreciate depth and character over maximum sparkle, who are drawn to Art Deco aesthetics, and who want a shape that is relatively unusual without being eccentric. It rewards careful stone selection and looks magnificent in the right setting.
Because it requires higher clarity grades than brilliant cuts and demands visual assessment rather than certificate-only buying, it benefits from working with a jeweller who can source and present stones specifically for you.