Hi Selina, there is a thread about these somewhere, I will try to trace it for you.
The Scandinvians use them for keeping food warm....my friend from Denmark always stood her teapot on one with a candle under it or her coffee pot....it looked very chic on the tea table.....she was the one who introduced me to Scandi glass.
I'll go and have a look for the link.
Ivo is absolutely correct Paşabahçe now make many of them and Glasi Hergiswill (Swiss) do as well.