ZBT's Coat-of-Arms (National Insigna) was designed in 1910. Two years later, the COA was modified by adding the 20 Pearls around the diamond which represented the 20 active chapters ZBT had in operation when they received formal recognition into the NIC in March 1912. The 4 points of the diamond represented the chapters of the North, South, East and West.
3D Version.
ZBT:"Honoring the Past, Celebrating the Present & Impacting the Future."