hello cubby - regret I can't tell you who might have made these, and am certainly no expert on 'Amberina'.....but - are you sure this is 'Amberina'? Some possible reasons for doubting the attribution might be......
1..........whilst the type can vary from clear yellow/amber to a deep dark red, generally where the heat has been struck the most the red is usually darker than yours - and less of an orangey colour.
2..........although I'm sure not impossible to create, I'm intrigued by those 'clear' tips - if the gold were dispersed throughout the metal and you heated anywhere near those extremities, you would, at least, end up with yellowy-amber tips, not clear ones.
However, you may well have provenance that proves me wrong