1. 玉 (yù): This is the most common character for jade, and it refers to the gemstone itself. It is used in both traditional and simplified Chinese.
2. 翡翠 (fěi cuì): This is a specific type of jade, known as "jadeite." It is a more specific term and often used in situations where you are referring to a particular kind of jade.
So, if you are talking about jade in general, use 玉 (yù). If you are talking about jadeite, use 翡翠 (fěi cuì).