My sense is that the success of a vase like this lies less in the complexity or originality of the technique and more in the taste of the person arranging the colours for the vase. I would guess that the colours comes from rods picked up up on the gather, marvered, and blown. It's a technique you'll see in many studio glass pieces around North America today. The colours could be picked up in different layers, with clear between, for example, and the finished product might be cased in clear, but it's still pretty much the same process. For it to work well, you need an experienced blower, who can envision how the colours will work together, and to recognize when enough work has been done on the hotworked piece to produce a satisfactory end result. The named technique that comes closest to this is probably calcedonia, where the swirls of colour are designed to represent a particular type of stone.
In other words, I think it may well be be a very attractive piece, but a relatively simple one to produce. That's why the style hasn't a name beyond marbled glass. I'd be interested in hearing from someone who has blown glass about they think, as all my knowledge here is totally theoretical.
It is a very nice piece, I agree, but it may not be quite so rare or valuable as you might think.