Karelian Heritage Shungite Loose Beads Set of 10 Pcs, Natural Black Stone Jewelry Supplies Authentic polished regular shungite beads for jewelry making The beads are made of III type regular shungite stones. Type III shungite contains up to 50% of carbon The quantity of shungite polished beads in the set is 10 pieces. The bead diameter is 8 mm (0.31 inches) Attention! The beads can leave black residue due to high carbon content. We recommend you to wash them carefully under the warm water to get rid of the post-production micro dust and powder. Manufactured by Karelian Heritage Company and comes in original packaging with a business card