Those are awesome (very much my style), and it should not be such an ordeal to find stones for them. However, the proportions of the designs require rather large center stones... Otherwise, I would suggest getting the rings done by the same maker, or expect modifications in design. Of course, inspecting the models before casting or such, give some control over the process: but all this requires attentive work.
I have to say that this 'overall look' is what top makers hope to achieve. It is not straight forward. In my experinec, any creative variation on those would take a good designer to ploy and a person (or a few, since some jewelry-makers would normally outsource some of the processes involved in making such a ring) with remarcable technical skills to achieve. You should consider seriously the maker based on his previous experience with similar designs (and these are highly innovative).
The rings in cause contain one a 5ct, and a 12ct center stone respectively. These are tanzanites. getting the same sizes in tsavo or spinel is a whole different story (and cost). For once, a 12ct, tsavo of top grade is not only a world class rarity, but the cheapest I found was 18K (I'd expect more like 25K from a mainstream source and a well cut stone, which is unlikely to be a pear). Five ct, is more likely. I don't see red spinels of this size to often either, and not too many people do (ok, a blue one did cross my way recently, much to my dispear). Such things come from a narrow stream of specialized sources... as far as I know. I would insist on a professional broker (this could be the cutter) for getting one.
Well, otherwise, if the design is to be customized to achieve the same 'look' for a given stone, than starting with a design and a gem is probably ok. Along this line, finding a jeweler who could make a design incorporating your imput & feedbach seems to be the key of the process (now that you have the assistance of a gem cutter...).
Hope all this is of some help...
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