At the Munich High End - 2019 show BlieSMa company presented the new tweeter line. This line consists of three models with 25-mm size membranes made of aluminium-magnesium, beryllium and diamond. Expected retail prices (approximately) for a piece:
T25A-6 - 130 EURO
T25B-6 - 250 EURO
T25D-6 - 1690 EURO
The tweeters will be available to order from November, 2019.
You can get familiar with the preliminary datasheets by the links below: