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.