Statement Antique Bronze Lava Stone Essential Oil Diffuser Necklace- 30". Our Statement Essential Oil necklace has been so popular we decided to do a dark version! Featuring an antique bronze colored pendant, this 30" long necklace has a black 316L Stainless Steel chain. A great option for those who are looking for something other than silver! Length: 30". Diffuser Pendant size: 1" x 1.25". Pendant Closure: Chain Secure. Pendant Material: Rhodium. Chain Material: 316L Surgical Grade Stainless Steel. Included in package: Necklace and three 14mm diffuser lava stones(assorted colors).