23.1 mm and the smallest bead is 9.3 mm. The item "VINTAGE BLACK CHERRY AMBER MARBLE BAKELITE FATURAN ROUND BEAD NECKLACE 72 grams" is in sale since Thursday, June 16, 2016. This item is in the category "Collectibles\Religion & Spirituality\Islam\Prayer Beads". The seller is "glitterbug_82" and is located in Clinton Township, Michigan. This item can be shipped worldwide.