
Jade was very important to the Ancient Chinese. It aided the conforting belief of magic powers. Jade played a great role in the higher society of China. The emperors were buried in it and sometimes even covered in it, like the jade suits which were worn by a prince and his wife in their burial tombs. It was thought as a powerful gemstone that could protect the body from decomposing.

Jade was mostly made for decorative uses instead of functunal purposes. Though, jade was involved with ritual ceremonies, burial ceremonies, and vessals. Jade was made into a variety of animals, like this one. It is of a bat.

A video I watched explained the difference of real jade to imitators. When jade is close to the light it is almost transparent. So if it has air bubbles then it is probably plastic and marble is too opaque. Here is the video it does not have great quality: http://www.youtube.com/watch?v=FUPZ__HpNRE&feature=related
I searched for awhile on youtube for a video which demonstrated how to carve jade in the old tradiontal style. Here is a great informative video:http://www.youtube.com/watch?v=d1oO1kbtt4s
Here are few websites: http://www.britishmuseum.org/explore/online_tours/asia/chinese_jade/chinese_jade.aspx