Analysis:

Jewelry and jade are divided into natural jewelry and artificial products according to their genetic types (that is, natural origin or artificial manufacture).

(1) Natural jewelry and jade

According to the causes and composition, it can be divided into:

1. Natural gems: such as diamonds, rubies, sapphires and emeralds.

2. Natural jade: such as jadeite, nephrite and jadeite.

3. Organic gems: such as pearls, corals, amber, etc. Cultured pearls also belong to this category.

(2) Artificial products

Man-made products refer to all or part of materials produced or manufactured by people and used as jewelry and decorations, which can be divided into:

1. Synthetic gems: such as synthetic emeralds and synthetic rubies.

2. artificial gem: Artificial yttrium aluminum garnet and artificial strontium titanate have not been found in nature.

3. Spliced gem: It is a kind of jewelry and jade that is made of two or more pieces of materials and gives people an overall impression. Short for "splicing stone".

4. Recycled gems: The fragments or chips of natural jewels and jade are welded or pressed into jewels and jade with an overall appearance by artificial means, such as recycled amber and recycled turquoise.

(3) Imitation of gems

Imitation gems are artificial products that imitate the color, appearance and special optical effects of natural jewelry and jade. Such as imitation diamond, imitation jade and so on.