Miyuki fine seed bead necklace This necklace is composed of Miyuki 11/0 (1.6mm) beads as well as a gold-colored stainless steel clasp and extension chain with a flat round stainless steel pendant as well. You can therefore shower or bathe with it without any problem, although the ideal is to remove it first to prolong its durability. The length of the necklace is 40cm at the tightest for a crew effect, and has a 5cm extension chain to wear it lower.