Amsterdam, Netherlands
A guided tour is given that's all about the diamond production process and the history of diamond trade in Amsterdam. Diamonds have been traded in Amsterdam for longer than 425 years, and the city used to be known as the "City of Diamonds". Tours are given in 27 languages. Of course you can also buy
Gassan diamonds here, but you don't have to.
Listen to the audio guide for Gassan Diamonds Free on WIP — starts by itself when you arrive, even with the screen off