This is an intriguing vase approx. 11 in (28 cm) tall which I has been handed in for selling on Ebay for a charity. The stem is a spiral twist of emerald green glass which seems to be cased in clear glass, and then each of the 6 lobes of the spiral have "run down" to make a chunky base. The glass at the rim is approx. 0.25 cm thick - it is a sold, chunky piece of glass. Any help on this id would be very welcome.