I would think your first stop ( phone call ) would be B&W .............
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I fixed a blown tweeter in a Matrix 801. B&W will sell you a diaphragm for about $40 or if you send them the tweeter housing, they will replace it for something like $100.
B&W 800-370-3740 (ask for parts, you will probably have to leave a message)
If you are mechanically inclined and good with a soldering iron, you can replace the diaphragm yourself. Take out the midrange driver and access the tweeter and remove it and take it apart. It is a little tricky but not that bad if you know what you are doing.
If you don't know how or are not experienced with soldering, send it to B&W.
The Nautilus is much easier to replace as you purchase a whole unit and just unplug the old one and plug in teh new one. The down side is that you pay $190 and only really needed a $40 part. The Diamond is about $1200 so I guess you can't complain.