Pair of Mid-Century Venetian Glass Bowls

There was a very interesting post by AnnaB from about 6 months ago featuring a vase by Vincenzo Nason. I thought I would post an article of some possibly related and earlier mid-century bowls from my collection.

These bowls are approximately 9" in diameter and 3" deep. The base glass is not black as in the case of the V. Nason descriptions, but rather a dark amethyst purple. You can tell when the bowls are backlit as in the first photograph. Copper aventurine is cased in clear glass above the amethyst base. In the case of one, it is in blobs, and the other in swirls. The rim is folded inward and down in one section only, and the base is ground so they will not roll when on a flat surface. Best of all, the original labels are still on the bowls. Both labels read, "Genuine Venetian Glass Made in Murano Italy". The green label is on the swirled bowl, and the red label is on the bowl with the blobs of copper. I believe that these date to the 1950s or '60s, possibly by Nason while at Venini?