It is "Vetro a retorti".
Individual cane lengths are set side by side and fused together to form the main structure of the item. Further embellishments can be added, such as the ruby prunts and rim of the plate / dish.
My "basic description" for the making of the canes in your item is:
Starting with a round, clear glass centre, two "gold aventurine" strips are added opposite each other, followed by adding more clear glass then two or more white "strips" in the same direction as the aventurine, then an outer coating of clear. When the whole mass is stretched in length it is also twisted - the tighter the twisting, the more complex the end result appears to be.
It is this sort of technique that links "ordinary" glass collectors with the rather "esoteric / nerdy" paperweight collectors (like me!). We all love a good bit of "retorti" (and "reticello" etc. )
