Preciosa is known for their authentically crafted bohemian crystal and fine jewellry stones made from the finest locally-suorced raw ingredients.Preciosa is unparalleled in both quality and shine. Every stone is carefully hand-crafted using centuries-old glassmaking techniques and natural Bohemian sand which is notoriously rich i silica and silicone oxide. Preciosa Crystal has a long, rich history and is well known throughout the beading world.