This is a nice tour around Amsterdam. The tour guide was very good and we saw quite a bit of Amsterdam. Anne Frank's house was insipring to really try to understand what they were going though.
The diamond cutting tour was awful. Very little time was spent on how they get diamonds or cut them or rate them. It really was more of a pushy sales job to get you to buy something. They lock you in a room to "tell you about diamonds" and show you some, but it seems like they won't unlock the door until someone buys something. Then the long walk out is past counter after counter of jewelry with everyone asking you to buy something.
Skip this and wander the street while everyone else is inside. Don't miss the bus though.
The windmills are also great to see, though none of them were turning or in use when the tour was there.