Approx 1.0MM please note it’s best to use 0.8MM string or smaller. The 1MM string will fit but keep in mind some beads on the strand may have a stubborn hole that won’t accommodate the string size.
FYI some beads have a ombré effect and or airbrush finish (they do not consider this a flaw)
Bead is fully colored no white shown by the holes
Colors may slightly vary in person