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The well-known Chinese “four great jades” are “Hetian jade” of Xinjiang, “Xiuyan jade” of Xiuyan town of Liaoning province, “Dushan jade” of Nanyang town of Henan province and “calaite” of Yun town of Hubei province.
Hetian jade
Hetian jade is mainly distributed in Xinjiang’s Shache — Tashikuergan town, Hetian — Yutian town and Qiemo town. This kind of jade contains tiny diopside, ophiolite, black lead and magnet and other minerals. The colors of the jade vary. There are white, turquoise, black and yellow and other colors. Most of the jade is monochrome jade, and a few are variegated. The quality of the jade is semitransparent, and after polishing, the colors are similar to that of fat. Its rigidity ranges from 5.5 degrees to 6.5 degrees. Hetian jade can usally be found mountains’ rock where the altitude is between 3,500 meters to 5,000 meters.
The breed of Hetian jade can be divided into eight species according to different colors and degrees of purity. They are white jade, suet white jade, white-greenish jade, gray jade, yellow jade, sugar jade, dark jade and jasper
Xiuyan jade
Xiuyan jade is produced from Xiuyan town of Liaoning province. Xiuyan town is a beautiful place where natural resources are plentiful. After millions of years of natural evolution, the land agglomerated radiance of the sun and moon and then produced the world-famous national treasure curio —Xiuyan jade.
As one of the Chinese four great jades, Xiuyan jade can be divided into two types. One is Old jade called Hemo jade, which has plain yet dignified quality a dark green color. The other one is Soft jade, which features a quality that is infarctate but gentle, fine and smooth, and a mainly green color. The colors of pure white and golden yellow are extremely seldom seen, so the jade with that kind of color can be seen as a priceless treasure
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Dushan jade
Dushan jade is also known as “Nanyang jade” or “Nan jade”, which is produced in Dushan just north of Nanyang city. As one of the Chinese four great jades, the quality of Dushan jade is tough and dense, exquisite, soft and moist, and its color is transparent. It has six colors: green, white, yellow, purple, red and black.
Calaite
Calaite is similar to emerald. It got its name because its color and shape is like a dark green pinecone. Calaite is one of the rare valuable diamonds in the world, and the goods produced with calaite have become an important collectable.
People have always been attracted to its green color and the grain of calaite. In ancient times, people related calaite with religion and superstition. In Tibet, people especially respect calaite. They see calaite as a divine decorative accessory, which can be used for rituals.
The color of calaite may differ because of the different elements it contains. Calaite will appear blue in color if it contains coppery oxide, and it will appear green if it contains iron oxide. The color of calaite is an important factor which can affect its quality.