First, the gem
Narrow gemstone concept: bright color in nature, good transparency, hardness not lower than glass (Mohs hardness is above 5.5), rare and chemically stable, even if the transparency is not very good, but have a special optical effect, the particles are larger than 3MM Can be honed into a gemstone jewelry mineral single crystal. In this narrow sense, all gemstones are single crystal, and jade is a polycrystalline structure. In a narrow sense, gemstones exclude jade.
The concept of generalized gemstones: in the color of the natural world, the transparency, the rareness and the chemical stability, can be honed and carved into the mineral or rock raw materials or finished products of jewelry and crafts. In this broad sense, gems and jade are part of the jade, which belongs to gems.
Gemstones are three characteristics: magnificent, rare and durable. Broadly speaking, diamonds, emeralds, crystals, agates, cat eyes, pearls, etc. all belong to gems. In a narrow sense, diamonds, crystals, and cat eyes are gemstones, others are not gemstones.
Second, jade
In the natural world, the color is beautiful, the texture is fine, the transparency is certain, the texture is hard, and the durability is durable. It can be carved into an ornament and can have a collection of one or more minerals. It can be recognized that jade has a wide range of covers, including jade and stone. For example, jadeite jade, nephrite and jade, Dongling stone, Tian Huangshi, bloodstone and so on.
Third, jade
Broadly speaking, jade includes a wide range, including not only nephrite, jadeite, but also jade such as Dushan jade, as well as agate, coral and other gemstones.
In a narrow sense, jade only includes nephrite - Hetian jade and jade jade - jade, only these two, this is also a more rigorous statement, although the classification problem of jade has been controversial and has not been completely resolved, but mineralogy has been returned class.
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