Originally, all jade objects were thought to be made from the same material. However, in 1863 a Frenchman, Alexis Damour, discovered that the material known as "jade" could be divided into two different minerals: jadeite and nephrite.Because these two materials can be difficult to distinguish, and because the word "jade" is so entrenched in common language, the name "jade" is still widely used across many societies, industries, and academic disciplines.In this article, the word "j...ade" will be used for undifferentiated materials. "Jadeite" or "nephrite" will be used when the identity of the material is known. The word "nephrite" is also an imprecise term. It is used for materials composed of the minerals actinolite and tremolite.Jade is a durable, colorful material that can be worked into shapes and given a high polish. These properties make it a very desirable gemstone. Jade has been used to make a variety of jewelry items such as pendants, necklaces, rings, bracelets, earrings, beads, cabochons, tumbled stones, and other items.These jewelry items are often made of solid jade, combined with other gems, or placed in settings made from gold, silver, or other precious metals. In addition to jewelry, jade is used to make small sculptures, ornaments, religious art, and small functional objects.This BC Green Jade Block Rough piece is 2.22 LB and is 4 3/8" x 3 3/4" x 2 1/8". I can sell Tiffany Stone in quantity. If you want to buy more than 50 LB of Tiffany Stone, contact me and I will give you 20% off !!!!!!!! You will not find better deals on Tiffany Stone anywhere!! I sell minerals, fossils and jewelry for several years on the internet. If you want some specific kind of stone let me know and I will try to find it for you.!I Thanks!!