Diamond cutter in the tower of glass

Where is Alfie's diamond cutter? I've searched for a while.. I found the fine pointed lock pick but can't find the cutter..?

You know I have a website where you can ask. Have you thought about posting there?

Yes, but this is the forum linked to the game, so I tried here first

It's actually not a specific diamond cutter. Just go buy a plain old diamond cutter from your local blacksmith