Asscher cut diamonds are experiencing a revival among San Diego couples seeking a distinctive center stone for custom engagement rings, according to Carl Blackburn of C. Blackburn Jewelers in La Jolla. The square cut with deeply clipped corners offers a “hall of mirrors” effect—broad step facets that create repeating patterns of light and dark, a more measured visual rhythm than the rapid sparkle of a round brilliant.
For Blackburn, the growing demand signals a shift in what couples value: not just rarity, but a stone with historical weight that can still be shaped into something personal. “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.”
The implications extend beyond aesthetics. Because the Asscher’s large, open facets make its interior especially visible, clarity and precise cutting become paramount. Blackburn begins by studying the center diamond—its outline, corner proportions, table, depth and reflection pattern—rather than applying a predetermined setting. This approach prioritizes the stone’s geometry as the foundation for the entire design, a method that can influence how jewelers and consumers alike evaluate diamond quality.
The choice of side stones further illustrates the cut’s versatility. 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 introduce a livelier sparkle. Metal selection also transforms character: white gold or platinum emphasizes clean Art Deco geometry, whereas yellow gold warms the frame and accentuates the clipped corners. Engraving adds softness; a restrained band yields a contemporary, minimalist look.
Prongs and understructure receive equal attention. The setting must protect the clipped corners without obscuring the outline. An open gallery can keep a substantial stone from appearing heavy in profile, while hidden diamonds or hand-finished metalwork add side-visible detail. These structural decisions affect durability and comfort, not just appearance.
The Asscher cut traces to Amsterdam in 1902, when 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. It became fashionable during the Art Deco era of the 1920s and 1930s, then receded as brilliant cuts dominated. Interest returned near the end of the 20th century, and in 2001 the Asscher family introduced the patented Royal Asscher Cut, adding 16 facets for a total of 74 while retaining the clipped-square form.
More than a century later, the cut moves easily between historical and modern design. Blackburn believes that 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.”
