Owing to the high value that the Romans placed on glass, it is likely that this drinking vessel would have been owned by a wealthy household, and kept aside for special occasions or honoured guests. The light-purple colour of the glass is produced by natural impurities in the raw materials; it has a high level of translucency, attesting to its quality.
The opening of the vessel is small, possibly to stop superfluous pouring. Just beneath the rim is a thickened band to stop any liquid form dripping down the body. The body is spherical, and decorated with ribbing. This rounded part is decorated with vertically radiating ribbing, suggesting that it was formed by blowing the glass into a mould. Such ribbing was a popular design for vessels of this period, and probably had a practical purpose, allowing for a better grip, as well as being aesthetically pleasing. It also allows for a play of light across the glass, creating stunning effects in shadow and reflection.