The most compelling part of the House of Gassan tour is seeing diamond cutting up close: rough stones become polished brilliants through skilled work, not magic under a display light. In a restored 19th-century factory, you get a short, guided look at the craft and the company’s long connection to Amsterdam.
I like two things in particular: the small group size, capped at six, makes it easier to follow the guide and ask questions, and the showroom visit gives the tour a useful, real-world finish. You can see loose polished stones, including the 121-facet GASSAN 121, as well as jewellery and Rolex watches.
The main consideration is the pace. Forty-five minutes goes quickly, and the visit includes a boutique and shopping experience as well as the factory explanation. If you want a long technical lesson, or need step-free wheelchair access, this is not the right fit.
- Key points to know before you go
- Inside Amsterdam’s historic diamond factory
- Watching a rough stone become a brilliant
- The showroom: stones, jewellery and Rolex
- Choosing the Diamonds in Style option
- Timing, arrival and getting there
- Who will get the most from this visit
- Should you book the House of Gassan tour?
- FAQ
- How long is the House of Gassan tour?
- Where is the meeting point?
- What departure times are available?
- How early should I arrive?
- Which languages are available for the guide?
- What is included in the Diamonds in Style tour?
- Is the tour wheelchair-accessible?
- Can I cancel for a refund?
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Key points to know before you go
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7 / 7- Watch diamond cutting in a working factory setting: The tour takes place in a restored 19th-century steam-powered diamond factory.
- See the GASSAN 121: This patented cut has 121 facets, a useful example of how cutting style affects a diamond’s appearance.
- Expect a very small group: The group size is listed as one to six participants.
- Plan for a showroom visit: The route includes loose polished diamonds, jewellery and a dedicated Rolex section.
- Choose between two tour options: The Diamonds in Style version includes a glass of champagne and a small-group guided visit.
- Allow for a brisk visit: The guided experience lasts about 45 minutes, and the building is not wheelchair-accessible.
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Inside Amsterdam’s historic diamond factory
House of Gassan occupies a restored 19th-century steam-powered diamond factory at Nieuwe Uilenburgerstraat 173-175. That setting gives the visit more character than a standalone jewellery shop: you are entering a place tied to diamond work, rather than seeing stones only after they have reached a display case.
GASSAN traces its diamond craftsmanship back more than 400 years. The tour connects that broader tradition with the practical steps involved in polishing a stone. You hear how a rough diamond is transformed into a brilliant, while the guide explains the process and offers historical context.
The company welcomes more than 350,000 visitors a year, so this is a well-established stop, not an intimate workshop visit arranged just for you. Still, a maximum group size of six is a useful advantage. You have a better chance of seeing what the guide is pointing out and asking a question than you would in a large crowd.
The experience is designed for a broad audience. There is no age limit, but infants and children must be included in the passenger headcount when you book. That makes the small-group rule worth checking if you are travelling as a family, since every person counts toward the stated limit.
You can also read our reviews of more tours and experiences in Amsterdam.
Watching a rough stone become a brilliant
The guided portion focuses on the craft of cutting and polishing. Rather than simply being told that diamonds sparkle, you learn about the work that creates that effect. Seeing the craft at close range is the tour’s strongest reason to visit, especially if you have mostly encountered diamonds in shop windows.
The GASSAN 121 is a natural centrepiece. It is a patented cut with 121 facets, and the guide explains what makes it distinctive. You do not need to know gem terminology to follow the basic idea: cut and polish shape how a stone catches light, and the GASSAN 121 gives the explanation a specific example to look at.
I would go in with one or two questions in mind. You might want to ask how the polishing process changes a rough stone, what the extra facets mean, or how to compare loose diamonds in the showroom. The tour is short, so a clear question can help you make the most of the guide’s time.
The stated guide languages are Chinese, English, Spanish, German, French, Italian and Dutch. That range is practical for an international visitor, though the exact guide you meet and the language used for a particular departure are not named in advance here. If language is important to your booking, confirm it before choosing a time.
The showroom: stones, jewellery and Rolex
After the factory explanation, the visit moves through the showroom. You can see loose polished diamonds, including the GASSAN 121, along with fine jewellery and luxury watches. There is also a dedicated Rolex section, so the tour covers more than diamond cutting alone.
This is where the experience shifts from craft to retail. That is not necessarily a drawback. Seeing finished pieces beside loose diamonds helps connect the polishing process to the objects people actually buy. It also gives you a chance to ask questions in a setting where the products are on display.
The personal shopping experience is included, but that does not mean you need to buy anything. If you are simply curious, you can treat the showroom as part of the explanation. If you are thinking about buying a diamond, the visit gives you a first look and a chance to ask questions, but a short tour should not replace comparing stones, prices and purchase terms independently.
One useful sign of the tour’s appeal is the personal account of a visitor who was surprised by how close the view of cutting and polishing felt, and who found the staff friendly. That reaction fits the format: the appeal is not just seeing a finished diamond, but getting an explanation while the process and products are close at hand.
Choosing the Diamonds in Style option
The Diamonds in Style tour includes a glass of champagne, a guided tour through the building in a small group, an explanation of diamonds and the GASSAN 121, and time for a personal shopping experience in the showroom. The champagne is a small extra, not the main event. The group size and guided access matter more if you want to ask questions.
The standard Free Diamond Tour is also offered. The listed starting prices vary by option: the overall experience is advertised from $11.79, while Diamonds in Style is shown from $16.80 and the free tour option from $0. The exact price depends on what you select, so check the package details at checkout rather than assuming the champagne version is included in the lowest advertised price.
At either price, value depends on your interest. If you enjoy learning how a specialist craft works, the short guided visit can be worthwhile even if you have no plans to buy jewellery. If you are mainly seeking a broad history of Amsterdam, this is a focused commercial and craft visit, not a general city tour.
The Diamonds in Style option makes most sense if you want the smaller-group format and a celebratory touch. If champagne is not important to you, compare the standard option before booking. The tour remains brief, and the core subject is the diamond work and showroom.
Timing, arrival and getting there
The visit lasts about 45 minutes. Available departures are listed at 11:00, 14:00 and 16:00, with return times of 11:45, 14:45 and 16:45 respectively. The available return time can depend on the departure you choose, so treat the listed schedule as a planning guide and check the time tied to your booking.
The meeting point is House of Gassan, Nieuwe Uilenburgerstraat 173-175, 1011 LN Amsterdam. Arrive 15 minutes before your selected departure. Late arrivals and no-shows are not refundable, so build in a little extra time to reach the address rather than aiming to arrive at the last minute.
The historic factory has a private mooring and can be reached by boat, which is a distinctive way to approach the building if you are already travelling on the water. Do not assume a boat ride is part of the tour, though: the meeting point is the House of Gassan, and the tour details do not include transport.
The attraction is open daily from 09:00 to 17:30. The activity is not wheelchair-accessible, an important limitation to consider before booking. A mobile voucher is accepted, and the voucher is valid only for the date and time specified.
Who will get the most from this visit
This tour suits you if you are curious about how diamonds are cut, want a quick indoor activity in Amsterdam, or enjoy seeing the craft behind luxury goods. The guide-led format and small group can make technical details easier to follow, while the showroom gives you a chance to look at finished jewellery and watches.
It can also work well if you are considering a diamond purchase and want an introductory look at the stones and the GASSAN 121. Think of it as an informative first stop, not a full buying consultation. Ask questions, take your time in the showroom, and compare any purchase carefully.
You may find it less satisfying if you want a long factory tour, a broad account of Amsterdam’s past, or an activity with no retail element. The boutique is part of the experience, and the 45-minute length leaves limited time for an extended technical discussion.
For a short visit, the combination is appealing: a historic factory, an explanation of cutting, a distinctive patented cut and a showroom under one roof. The tour is not a substitute for a full museum visit, but it offers a close look at a craft that most people usually see only in its finished form.
Should you book the House of Gassan tour?
Book it if diamond craftsmanship interests you and you want a compact, guided visit with a small group. The best reason to go is the close look at cutting and polishing, followed by the chance to see the GASSAN 121 and loose stones in the showroom. The friendly staff and direct explanations add to the appeal.
Skip it if you need wheelchair access, prefer a longer technical tour, or would rather avoid a showroom setting. Before paying, compare the standard tour with Diamonds in Style and confirm the chosen language and departure time. If those details fit your plans, 45 minutes is a tidy way to see a side of Amsterdam you might otherwise miss.
House of Gassan Diamond Tour in Amsterdam
“Honestly this surprised me. Up close and personal look at how diamonds are cut and polished. incredibly friendly and knowledgeable staff. When the…”
FAQ
How long is the House of Gassan tour?
The guided visit lasts about 45 minutes.
Where is the meeting point?
Meet at House of Gassan, Nieuwe Uilenburgerstraat 173-175, 1011 LN Amsterdam.
What departure times are available?
Departures are listed at 11:00, 14:00 and 16:00. The available return time depends on the departure selected.
How early should I arrive?
Arrive 15 minutes before your booked departure time. Late arrivals and no-shows are not refundable.
Which languages are available for the guide?
Guide languages listed are Chinese, English, Spanish, German, French, Italian and Dutch.
What is included in the Diamonds in Style tour?
It includes a glass of champagne, a small-group guided tour through the building, an explanation of diamonds and the GASSAN 121, and a personal shopping experience in the showroom.
Is the tour wheelchair-accessible?
No. The activity is not wheelchair-accessible.
Can I cancel for a refund?
You can receive a full refund if you cancel at least 24 hours before the activity date, using destination local time.
