Alexandrite / Neodymium - bear and fish

Two examples of this colour changing glass I have no idea whether it is swedish or czech but they are quite heavy for there size and beautifuly balanced
The bear is free standing from the ice floe and there is only one spot (not marked) were he will stand without having a slight rock
The lilac colour turns to blue under artifical light due to the neodymium oxide used in the making
If anyone knows anything more about these I would be pleased to hear