Top Plaza Natural Lava Stone Aromatherapy Locket Pendant Essential Oil Fragrance Diffuser Necklace(OM Symbol) Material: White-K gold electroplated on copper for locket pendant and necklace. Locket Pendant Size: 36*25mm Fit for 20mm beads or Pompon. Ball Size: 17mm Package includes: 1Locket Pendant 1 28-29.5''chain 1 stone bead This reusable round black lava stone provides the best way to diffuse essential oils on . Not only does it give the necklace a great look, but it is a porous material that will hold the oil for hours. It holds the oil longer than the traditional leather discs or poms. Shipping time is usually about 2-3 weeks with USPS.Each order comes with a grey velet bag with brand name"Top Plaza".