To judge jade from raw stones, one must consider several key factors. First, examine the color, which should be uniform and vibrant. Green jade, for instance, should have a rich, deep hue. Second, assess the texture, which should be smooth and free of cracks or inclusions. Third, consider the weight, as jade is dense and heavy for its size. Lastly, look for the presence of a "luster," which is a subtle sheen on the surface. These characteristics help differentiate genuine jade from imitations.

The ability to judge jade from raw stones is crucial due to the high value and demand for this material. According to the Gemological Institute of America (GIA), jade is one of the most sought-after gemstones globally, with an estimated market value of over $10 billion annually. This demand has led to an increase in the number of fake or treated jade products, making accurate identification essential. The GIA also reports that over 90% of jade jewelry sold in the United States is treated or imitation, highlighting the importance of proper identification techniques.