Jewelry refers to stones or minerals that can meet the requirements of jewelry after grinding and polishing. This precious ore is bright in color and high in hardness, and will not change under the action of atmosphere and chemicals. Can be used as instrument bearings, abrasives, decorations, etc. It also refers to precious stones.
brief introduction
Gems are the most beautiful and valuable minerals in rocks. They are bright in color, crystal in texture, brilliant in luster, hard and durable, and rare.
Natural mineral crystals that can be used for jewelry and other purposes, such as diamonds, crystals, emeralds, rubies, sapphires and emeralds (metamorphic rocks, cat's eyes). There are also a few natural single mineral aggregates, such as Wulanmunu and Opal. There are also a few kinds of organic substances, such as amber, pearls, corals, coal powder, etc., which are also included in the broad sense of gems.