The Contriva Diacera TT was a limited series of only 5 pairs with the original Sunray drivers, pure silver parts (as for our Sunray / T1 models), a whole new internal wiring concept incl. a new terminal for passive and active bi-amping incl. our silver/goldplated softcopper binding posts from the Sunray.
Well, the drivers itself were more expensive then the drivers we build into our other speakers, but this is just a smaller part on the list, the major part and biggest difference is the massive silver PIO Cast parts we used for this speaker and the whole new x-overdesign which we adopted to the new drivers. And I am not talking about some standard silverfoil caps as for e.g. Mundorf Supreme parts, I am talking about high µF-values in massive silver, and these parts alone are more expensive then the big diamond tweeter in it.
The two aluminum rings in the front do have a positive influence to the reflections of the grills and just show that it is not just a "tuned Contriva Diacera". Each pair also needed much more hours to build it then a serial pair of Contriva Diacera. If one is one of the few persons who saw and heard one then one should know if this speaker is a different ballgame even the serial speakers :-).