This necklace is intended to be worn with the “clasp” in front. The large blue Lapis focal bead is the center of attraction. The Lapis blue links can be brought down through the round part of the toggle clasp to make the necklace shorter. Depending on your neck size, you could wrap this twice, and bring the bar part of the clasp back through the round part again.
This is definitely not recommended for children under 10 since most children would get carried away and wind up choking themselves with it unintentionally.