Natural Stone Jewelry Crystal Quartz Gemstone diffusing necklace is available in three different options. Select “Cool Toned” for deep blues, navy, purple and dark emerald colored necklaces. Select “Warm Toned” for lighter pinks, light purple and pale orange-red colored necklaces. Select “Neutral Toned” for cream, beige, black and grey colored stones. The “set of 3” selection includes a necklace from each category listed above. All necklaces are 35cm in length. Necklace chains are gold in color. Simply drop 1-2 drops of essential oils onto the pendant of your crystal necklace. The semi-porous properties of the natural stone absorb oil and act as a diffuser accessory piece. Customers report that scents last as long as 48 hours before new oil should be added. We do not recommend extended water exposure to necklace chain. Who knew your newest fashion statement could double as a walking diffuser? The perfect boho statement piece for your oily bestie and an ideal present.