Jade is a deep green gemstone that's used in jewelry and ornaments. Your most beloved possession might be an antique jade brooch that belonged to your great-grandmother.
Jade is a mineral that's mined, cut, and polished to make gems, sculptures, and other art objects. You can also use the word jade to talk about the typical green color of the stone — you might describe the color of your new car, for example, as jade green. Yet another meaning of jade is "become bored or tired," along with the more common adjective, jaded, or "lacking enthusiasm."