Locket Measurement Average: 32mm- Inner 30m & 25mm Chain Syle: Link Chain Material: Metal / Metals Type: Zinc Alloy These amazing necklace can be used everyday, also includes addition filter pads to switch color and style. This Essential Diffuser Necklace Antique Vintage Locket will help with mood, energy, spirit and getting through your day. We highly recommend to use our Doterra Essential Oils they are pure, organic and safe. Fun Fact: Everyday use for AromatherapyEssential Oil Diffuser (Recommended Doterra Essential Oil). Each doTERRA essential oil is also carefully and thoroughly tested using the strict CPTG Certified Pure Therapeutic Grade® quality protocol. Experienced essential oil users will immediately recognize the superior quality standard for naturally safe, purely effective therapeutic-grade doTERRA essential oils. While there is a science to the distillation of essential oils, it is also an art.