When the weather gets cooler, colors tend to get darker. Enter this season's jewel tone trend. Really, jewel tones are just the richer, more luxurious cousins of our favorite go-to hues. In fact, every color of the rainbow has a jewel-toned counterpart: Red = Ruby, Orange = Amber, Yellow = Citrine, Green = Emerald, Blue = Sapphire, Purple = Amethyst. So when you want to create a cozy, glowing atmosphere, simply trade in trade in brights for gemstone shades and watch your space transform from energetic to romantic. Here are the 4 "jewel rules" we like to follow.