Zengo Rutilated Quartz Natural Stone Vial Necklace All vial necklaces are on a leather cord that adjusts from 22" to 42" in length Vials vary from 1.5" to 2.5" in length Shapes and colors will vary slightly, as all vials are natural stones and crystals Use the included pipette to fill the vial with your favorite essential oil or perfume. Simply unscrew the top, add the oil and reattach the top. Necklace will not diffuse oils on its own.