Alexandrite glass purple penguin figure colour change vintage. Neodymium glass was produced throughout the world in the early 20th century, after Alexandrite crystals were discovered in 1885 and neodymium oxide (Nd2O3) was used to colorize glass. Leo Moser of Moser Glass was the first to develop the commercial use of neodymium in glass. Weight 281 g. The item origin from a craft manufactory in the Czech Republic, I guarantee their originality. The delivery is traceable, the delivery time is usually a maximum of 10 working days. (Less in Europe, more for the rest of the world). If you have any questions about the product, feel free to ask.