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Gems are the most beautiful and precious kind of rocks. They have bright colors, crystal texture, brilliant luster, hard and durable, and they are rare.
They are natural mineral crystals that can be used to make jewelry, such as diamonds, crystals, emeralds, rubies, sapphires, and golden emeralds (allex, cat’s eye), Etc.; there are also a few natural single mineral aggregates, such as agate and opal. There are also a few organic materials, such as amber, pearl, coral, coral, and ivory, which are also included in the broad sense of gems.
There are two types of jade, soft and hard. The usual jade refers to nephrite, and jadeite has another popular name-jade. Nephrite is a narrow sense only refers to Hetian jade, and in a broad sense includes more than ten kinds of nephrite, such as Xiuyan jade, Nanyang jade, and Jiuquan jade.
Many nephrite jades have a long history, such as Xiuyan jade. Jadeite refers only to jade.