This year marks the 21st anniversary of GASSAN 121, our signature diamond cut featuring 121 facets. We are delighted to celebrate this special milestone with you.

As we celebrate 21 years of GASSAN 121, we reflect on the story behind this unique diamond cut, developed in-house by our family-owned company, which was founded by Samuel Gassan as a diamond-cutting business in 1945.

Discover our exclusive anniversary pieces, now available online and in our boutiques.

To celebrate 21 years of GASSAN 121, we are proud to present a special anniversary collection, with the GASSAN 121 diamond taking centre stage. Every piece embodies the fifth C that GASSAN has added to the traditional four Cs: Confidence, the assurance of proven quality.

In 2005, GASSAN unveiled a diamond with an innovative new cut at the Miljonair Fair at RAI Amsterdam: the GASSAN 121. While a traditional round brilliant-cut diamond has 57 facets, the GASSAN 121 features 121, with 16 additional facets on the crown and 48 on the pavilion. The Scientific and Technological Research Centre for Diamonds (WTOCD) confirmed that these additional facets enhance the contrast between light and dark, a defining characteristic of the GASSAN 121 cut. Since its introduction, the GASSAN 121 has been at the heart of several special milestones, including a limited-edition anniversary set celebrating its 10th anniversary and a prominent place in the collection marking 80 years of GASSAN.

If you choose a loose GASSAN 121 diamond, our goldsmiths can set it into the piece of jewellery of your choice in just 30 minutes. At GASSAN, our diamond cutters are also at work 365 days a year, offering you the opportunity to see first-hand how a diamond is expertly cut and faceted. This craftsmanship is reflected in every GASSAN 121 diamond we set. Prefer a piece of jewellery that is ready to wear? Explore our GASSAN 121 jewellery collection online, featuring a selection of rings, earrings and more.