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Diamond drivers

Out of curiosity I was wondering why diamond speaker units seem to be on the rise. Brands like Marten Design and B&W and many more are selling speakers with diamon tweeters. So what does make a diamond tweeter so good? Or is it just marketing hype. Although I doubt Janzen en Accuton are just making diamond tweeters for marketing reasons.

Yesterday evening I spend two and a half hours listening to the new Raidho D-1 speakers, they use a ribbon tweeter and a diamond mid/bass unit. I have to say this is the best monitor speaker I have ever heard. It is also a 17.000euro monitor speaker so for that price it better be very good.
mordante

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kijanki
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Steve Mowry says in the article "The Whole Truth About Beryllium Diaphragms: -

"For a given geometry the first bending (break-up) frequency is proportional to the material Speed Of Sound, where the speed of sound within a material is defined as the square root of the YoungÂ’s Modulus divided by the Mass Density, (m/s); the higher the better. However, the Mass of the diaphragm must also be considered. Then the ratio of the Speed Of Sound to the Mass Density can be used as the materialsÂ’ acoustic figure of merit, (m4/kg/s); the higher the better."

After that he shows values of "Acoustic Figure of Merit" for different material (higher the better)in m4/kg/s

Berillum - 6.97
Diamond - 4.92
Aluminum - 1.86
Titanium - 1.13
Steel - 0.63
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