Amsterdam tourist shops usually have a good selection of ceramics with little colorful canal houses being very popular. Delftware is of course more expensive. Be sure to get a certificate of authenticity to guarantee its Delftware. Diamonds are still cut in Amsterdam as they have been for centuries. Don’t expect any bargains, but you should be able to find a good selection if you visit one of the larger places like Coster Diamonds (free tour), founded in 1840, across from the Rijksmuseum.