Wholesale Aromatherapy Toscana Locket Necklace by Relaxus Aromatherapy The Aromatherapy Toscana Locket Necklace is stainless steel and has an adjustable chain length 60 cm + 5 cm. Each locket necklace includes five interchangeable coloured pads for diffusing your favourite essential oils in style. How to use Simply apply 1-2 drops of essential oil to the diffuser pad inside the locket and you’re ready to go.