Jadeite is the same hardness as quartz, whereas nephritis is a little smoother. Both nephrite and jadeite are tough, but jadeite is harder than nephrite. Jade Jewelry Jade is found in small numbers of pit-houses and burials. The craft production of small comma-shaped and tubular "jades" using materials such as jade, microcline, jasper, etc., in southern Korea originates from the Middle Mumun Pottery Period. Jade Rings It was not until the 19th century the French mineralogist determined that "jade" was in fact two different materials. Jade Bangle River jade collection was concentrated in the Yarkand, jade Jade Black and White rivers. Jade Necklaces The kingdom of Khotan, in the southern section of the Silk Road, yearly tribute payments consisting of white jade, the most valuable have been made to the Chinese imperial court and has worked in the art by skilled artisans that jade had been worth more than gold or silver.