The company I believe you are thinking of is Ngwenya Glass in Swaziland, Christine.
To be honest I can't rule them out but I haven't seen anything as complicated as this from their glass shop... but it is well worth investigating.
The history of this Glass company is very interesting and if you go on line with Ngwenya Glass History, you can read how a team of glass blowers from Sweden (Orrefors, I believe) went out to Swaziland to teach glassblowing using recycled glass in an attempt to help give work and export trade to the people there.
Children would scour the area looking for abandoned glass bottles to hand in and were rewarded with a small payment for them.
A positive outcome of this was that there were less bottles lying around in the bush and this significantly reduced the number of bushfires caused by the sun being focussed through the abandoned glass bottles.
A win-win situation.