Generally speaking, gems are made of natural single crystal minerals, that is to say, a gem is usually made of single crystal, and the crystal is visible to our naked eyes (so it is also called crystal). Gemstones are usually transparent. After the light enters the cut gemstone, we can see the flash of gemstones, such as rubies, sapphires and emeralds, after a series of reflections and refractions. There are also a few natural single minerals, such as opal and lapis lazuli, and some organic substances, such as amber, pearl, coral and ivory, which are also included in the generalized gems. They are also called biological gems.

Jade is made up of countless tiny crystals that we can't see with the naked eye. Its structure can only be seen clearly under a high-power electron microscope, so people call jade an aphanitic mineral. Broadly speaking, the * * * bodies of these tiny crystals can all be called jade.

Usually people talk about jade, mainly referring to Hetian jade and jadeite, which are internationally recognized as relatively valuable jade.

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Jewelry and jade refers to all kinds of rock and stone mineral materials that can be used as decorations, handicrafts or souvenirs. It is the general name of natural jewellery and jade (including natural gemstones, natural jade and natural organic gemstones) and artificial products (including synthetic gemstones, artificial gem, assembled gemstones and recycled gemstones), and is referred to as gemstones for short.

Natural gemstones refer to natural, beautiful, durable and rare mineral single crystals or double crystals that can be processed into decorations.

Jewelry and jade Baidu encyclopedia