Designed by a French designer, who was inspired by natural gems (which is where it gets its name), this beautiful, glowing diffuser coupled with the relaxing smells of essential oils will sooth after a rough day. The high quality, lightweight plastic gives the illusion of glass without the heft or fragility. Emphasizing the gem colors are the lights. Gem has three light settings: oscillating, reminiscent of the waves of the ocean; steady, at a level between dim and bright; and off. You can choose which setting you use and have control over the ambiance of your room.