At this vast workshop, you'll get a quick primer in assessing the gems for quality, and see diamond cutters and polishers in action. The one-hour tour is the best of its kind in town.
The factory sits on Uilenburg, one of the rectangular islands reclaimed in the 1580s during a sudden influx of Sephardic Jews from Spain and Portugal. In the 1880s Gassan became the first diamond factory to use steam power.
