Natural Lava Stone Nazar Boncuk Eye Lithotherapy Bracelet The Nazar Boncuk eye is a lucky symbol. Dimensions: Length: 18 cm (other sizes available on request) Elasticated, it adapts its size to that of your wrist and can therefore be worn by the vast majority of adults. Diameter of beads: 6 or 8 mm. As each stone is unique, with its own characteristics, the bracelet you will receive may differ slightly from the one in the photo (darker or lighter). Rolled stones of “extra” quality: very hard, without rough edges. About the gem: Natural lava stone, also called basalt.