Are my " diamond " tweeters really diamond

I sincerely doubt they are real natural diamonds. I was in the business of attaching diamonds to stainless steel wire via nickel and copper electroplating for the slicing of silicon wafers for the solar industry. Industrial man-made diamond dust perform and don't cost what one would pay for crushed nature-pressurized 'real' diamonds. The make-up is the same.

I'd bet plenty they are man-made when used in speaker cones or tweeters. Sadly I never heard a B&W diamond tweeter that did not hurt my ears; not sure about Usher as I've liked their earlier models plenty. Give me a silk dome or better yet a sealed film like Raidho or Borresen. To each his own, but needles in my ear are not appealing...

It is a vapor deposition so extremely thin coating.

@musicaddict - You are right that none of them are "natural" diamonds. I suspect some of the most famous brands with diamond tweeters may be coated with diamond dust from natural diamonds like the common nail file.

The most ridiculous use of actual single crystal diamonds is probably from the likes of Accuton and the Chemical Vapor Deposition they use for their mids and tweeters.

I’m afraid Accuton for me falls into the twin categories of amazing engineering and not really interesting to listen to.