- antique collection glass, created in the middle of the 19th century by Czechoslovak craftsmen from Gablonz, during its production, pure gold was poured into sapphire glass, the effect was very powerful and unusual: overflows from pink to blue sapphire, at the beginning of the 20th century, production abruptly stopped due to harmfulness and the high cost of the process, the recipe has been lost and have become a coveted item for collectors around the world.
