According to relevant public information, Africa is one of the most famous places of scattered gems in the world, such as Tanzania, Mozambique and other countries, which produce a variety of scattered gems, such as rubies, sapphires and jadeites. Gem refers to the kind of stone or mineral that can meet the requirements of jewelry after grinding and polishing. It is a precious ore with beautiful color and high hardness, which will not change under the action of atmosphere and chemicals.