Bowers & Wilkins looked to one material to raise the bar in terms of audio quality with their latest 800 Series speakers. The speakers now use diamond tweeters capable of achieving accurate high frequency sound and have been tweaked in specific areas creating a sound profile that leapfrogs the previous generation with bigger bass and significantly less distortion. Link
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B&W's 800-series speakers have had diamond tweeters for over two years now in the 800D, 801D, 802D, and 803D. Only the 804 and 805 are new to the Diamond range
These are the best speakers in the world. Like you expect, they are crazy expensive too. Only people with the most impeccable taste and large wads of cash own them.