I found three of these so I'm assuming drinking glasses rather than candleholders, especially as the inside base is dipped rather than level (although that'd work for a ball candle!)
The colour is a sort of dull greyish-green, the glass is thin but doesn't feel delicate as such, although those stems worry me a little! Dimensions are as follows:
height 4½" (114mm), bowl diameter 3⅝" (92mm), foot diameter 2⅝" (68mm).
The foot isn't flat below, it is slightly domed to where the foot meets the stem. The bowl rim is rounded and fire-polished. They are very grubby and in need of a good wash!
I'm sure I've seen these before, but cannot think where, and can't find them again online. Does anyone recognise them please, or suggest a maker or a place to search for info?