UPDATE: My friends LOVES this and sent me a photo. He was able to turn it blue, his favourite colour. I got this as a Christmas present for my friend. It took a long time for it to arrive, so he was away when it finally showed up. I don't know what those different colours signify that look like gems in the picture with the lamp and the description didn't say anything about them, either. I hope my friend likes the lamp and that it didn't arrive damaged. I also hope he doesn't have one already. But really, is there such a thing as too many salt lamps?