Wow that is a long way from home! It was born in Byron Bay, the Easternmost place in Australia towards the end of the glass making life of Colin Heaney. Who stopped several years ago and now designs silk prints, materials and clothes. I love his work, and have about 15 items, but most of it is iridescent. If you Google "Colin Heaney Glass" and then look in photos you will find very similar pieces. I recognize the signature.
Ross