I found a bowl that looks a lot like yours but in topaz. It has a Seguso VA label and is from 1960. The one in the auction catalog is 17 cm in diameter and very thick walled, but looks like it is not cased -- hard to tell from the picture because I can't see the lower portion.
Where did you buy your bowl, Kane. Since your bowl is added for reference, it would be good to know a little bit more about it and the attribution.