For five centuries, Preciosa has seamlessly blended ancient tradition with innovative new technologies to create crystals and fine jewelry stones of unparalleled quality. Founded in the Crystal Valley of Bohemia, the local sand used in every Preciosa Crystal is uniquely rich in silicon-oxide - producing brilliantly radiant crystals unrivaled around the world. Preciosa is extremely proud of their long heritage, and continues to produce authentic Bohemian crystal to this day.6mm Bicone Crystal BeadHole Size: 0.9mmArticle #: 451 69 302Genuine Preciosa Crystal BeadsOver 470 years of crystal making tradition right in the heart of the Bohemian Crystal Valley