Crystallo products are made from the Genuine Bohemian Crystal (GBC) and therefore of the highest quality. GENUINE BOHEMIA CRYSTAL hand-blown and hand cut crystal products show a high refractive index and GORGEOUS GLITTER.? Products made of Genuine Bohemian Crystal are heavier and more massive than comparable ordinary glass products. If you tap on glasses or open bowls, the lead crystal product will produce a long, bright ringing sound. The lead crystal color is neutral.