Asscher cut diamonds are experiencing a surge in popularity among San Diego couples in search of a distinctive center stone for custom engagement rings, according to Carl Blackburn of C. Blackburn Jewelers in La Jolla. The square-cut diamond with deeply clipped corners and broad step facets creates a repeating pattern of light and dark that Blackburn describes as a "hall of mirrors" effect—a more measured and architectural sparkle compared to the rapid brilliance of a round cut.
Blackburn has observed increasing demand for Asscher cuts from clients who desire a ring with historical character but not necessarily an antique design. "An Asscher cut gives the entire ring a clear sense of structure," Blackburn said. "Its proportions and faceting can guide every other decision, from the side stones and prongs to the metal, gallery and band." This structural quality allows the cut to serve as a foundation for a fully personalized piece, rather than conforming to a predetermined setting.
The design process begins with the center diamond itself. Blackburn studies the stone's outline, corner proportions, table, depth, and pattern of reflections before determining how the surrounding elements should be developed. Because the Asscher's large, open facets make its interior especially visible, clarity and precise cutting are paramount. From there, he considers whether the setting should extend the diamond's geometry or contrast with it. Step-cut side diamonds can continue the center stone's orderly reflections, while tapered baguettes or trapezoids create a gradual transition to a narrower shank. Brilliant-cut accents can introduce a livelier sparkle around the center.
Metal choice further shapes the Asscher's character. White gold or platinum can blend with a colorless diamond and emphasize the clean geometry associated with Art Deco jewelry. Yellow gold establishes a warmer frame, making the clipped corners more pronounced and moving away from a cool palette. Engraving adds softness, while a restrained band can give the diamond a contemporary, minimalist appearance. Prongs and the structure beneath the diamond receive equal attention: the setting must protect the clipped corners without obscuring the outline that makes the cut recognizable. An open gallery prevents a substantial stone from appearing heavy in profile, and hidden diamonds or hand-finished metalwork can add detail visible only from the side.
The Asscher cut traces its origins to Amsterdam in 1902, when diamond cutter Joseph Asscher developed and patented the original design. Its 58 facets, high crown, small table, deep pavilion, and cut corners distinguished it from other shapes. The cut became fashionable during the Art Deco era of the 1920s and 1930s, when its symmetry and stepped forms aligned with the period's architecture and fashion. Its popularity later waned as brilliant cuts dominated the market. Interest returned near the end of the 20th century as collectors and couples rediscovered vintage jewelry and geometric shapes. In 2001, the Asscher family introduced the patented Royal Asscher Cut, adding 16 facets for a total of 74 while retaining the distinctive clipped-square form.
More than a century after its creation, the Asscher cut continues to move between historical and modern design. Blackburn believes this adaptability accounts for its renewed popularity among couples who want something recognizable but less conventional. "The cut brings its own history and personality, but it does not dictate what the finished ring has to be," Blackburn said. "That leaves room to create something personal rather than simply reproduce a period style." The trend signals a broader shift in the bridal jewelry market toward customization and individuality, with consumers favoring pieces that reflect personal stories over mass-produced styles. For jewelers, this means a greater emphasis on bespoke design services and a deeper understanding of how cut, setting, and metal interact to create a cohesive ring. As couples seek engagement rings that stand apart, the Asscher cut's architectural elegance and historical depth position it as a compelling choice for those who value both tradition and innovation.
