Gassan Marks 21 Years of Its 121-Facet Diamond
Gassan has released a special collection celebrating the anniversary of its diamond cut, now available at airport locations.
Updated on Nov. 2, 2026 in Jewelry
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Dutch jeweler Gassan has marked the 21st anniversary of its Gassan 121 diamond cut with a special collection. The anniversary pieces are available at its retail locations at Schiphol and Changi airports.
Why it matters
The collection highlights the cut's continued prominence in Gassan's lineup, which is built on a diamond design the company describes as its best-selling. Its availability at international airport retail points places the anniversary pieces in front of travelers across markets.
The Gassan 121 has 121 facets, compared with 57 in a traditional brilliant cut, including 16 extra on the top and 48 on the bottom. The design was independently assessed by the Scientific and Technical Research Centre for Diamonds in Antwerp, which confirmed greater brilliance than a traditionally cut diamond.
The players
Gassan
Gassan is an Amsterdam-based jeweler founded in 1945 that operates 13 retail outlets at Schiphol Airport and eight shops at Changi Airport.
Steve Bierman
Steve Bierman is a Gassan diamond buyer and former diamond cutter who developed the Gassan 121 cut.
Scientific and Technical Research Centre for Diamonds
The Scientific and Technical Research Centre for Diamonds is a research body in Antwerp that independently assessed the Gassan 121 design and confirmed its greater brilliance.
The details
Gassan 121 was developed in 2005 by Steve Bierman, a Gassan diamond buyer and former diamond cutter, after years of research, more than 50 studies and extensive calculations. The company releases limited editions of the 121 each year with special engravings, and the anniversary collection is available at its Schiphol and Changi airport retail outlets.
Timeline
- 2005: Gassan 121 diamond cut is developed.
- 1945: Gassan is founded.
- November 2, 2026: The 21st anniversary collection is announced.
Market Landscape
The Gassan 121 measures itself against the traditional 57-facet brilliant cut, adding 64 facets to pursue greater brilliance within the diamond market. Its status as Gassan's best-selling diamond and the most popular diamond in the Netherlands places the cut at the center of the company's competitive position.
Shoppers traveling through Schiphol or Changi airports can browse the anniversary collection directly at Gassan's retail outlets there. Buyers interested in the Gassan 121 can also look for the limited editions the company releases each year with special engravings.
The takeaway
The Gassan 121 shows how a cut's facet count can be tied directly to a measurable claim of brilliance, which makes it useful to compare designs by the numbers before buying. Shoppers can check whether a diamond's cut has been independently assessed, as this one was in Antwerp.
Further reading
Explore more in Jewelry for other pieces and trends in the category.
Source note: This article includes information reported by DFNI.
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