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Gassan Diamonds, traditionally a family business, is housed in a beautifully restored factory in the center of Amsterdam. This former steam-driven diamond cutting factory was built in 1878 and was the largest diamond factory in the world with 400 diamond cutters. Today, visitors can admire the art of the centuries-old craft of diamond cutting, while an explanation can be given in 26 languages about where diamonds are found and how a rough diamond can be made into a brilliant diamond. Gassan Diamonds has its own workshop where jewellery is designed and where diamonds can be set into beautiful jewellery.

For generations the Gassan Diamonds diamond cutters have optimized the magnificent splendor of a brilliant cut diamond. They worked on the symmetry of each of the 57 facets with only one goal in mind: perfect beauty. Of course the next generations of diamond cutters will still be working on the same goal.

However, Gassan Diamonds proudly presents the next step to perfection, a new breathtaking cut: the Gassan 121. With no less than 121 facets, this diamond cut is unique in its kind.

In comparison with the traditional brilliant cut, the Gassan 121 has 16 extra facets on the top and 48 extra facets on the bottom, creating a perfect brilliance, in other words: perfect beauty. According to a report by the WTOCD (part of the High Council of Diamonds in Antwerp), the additional facets enhance the contrast between the light and dark parts in the diamond, giving the Gassan 121 its spectacular appearance.

Therefore, we would like to invite you to come here yourself and to look over the shoulder of one of our diamond cutters, while they are engaged in achieving the perfect beauty of the Gassan 121.

Following the 425 year old tradition of ‘Amsterdam City of Diamonds’, Gassan Diamonds provides a unique tour through history and you can see for yourself how the craftsmanship of our diamond cutters and goldsmiths brings the wondrous world of diamonds to life.

The cutting factory is open 7 days a week from 9 am to 5 pm, throughout the year, and can be reached by bus, tram or canal boat.

After the guided tour you are always cordially invited to come and drink a (free) cup of coffee, tea or a soft drink in our own coffee shop.

Nieuwe Uilenburgerstraat 173-175,
1011 LN Amsterdam
The Netherlands