Generally refers to the floorboard of gems, namely precious and rare pearls and jadeite gems.
Rare things are precious, and emeralds are extremely rare in the world. Among the national stones in China, the top five are: xiuyan jade, Nanyang jade (unique jade), Kunshan jade (Hetian jade), agate and turquoise.
Because of its high value, people must expect it to be durable, valuable and even heritable. One of the reasons why diamond is the most expensive gem is that it is the hardest in the world and is not afraid of corrosion, so most of the gems in the world are silicate minerals (such as jadeite) with high hardness and corrosion resistance.
A few oxides (such as rubies and sapphires) and simple minerals (such as diamonds), while soft and corrosive gems (such as jadeite and southern jade) are of low value and are often used to make handicrafts to win; But there are also a few precious stones that are not included, such as opals and pearls.
Jewelry: generally refers to jewelry, handicrafts or other treasures made of natural materials (minerals, rocks, organisms, etc.). ), gold and silver with certain value are collectively referred to as jewelry, so there is a saying of "gold and silver jewelry", and jewelry stores that operate these items are also collectively referred to as "jewelry stores". Scientifically speaking, the concept of "jewelry" is the same as "gem" in a broad sense.
Gems in a broad sense generally refer to those raw materials suitable for polishing or carving into jewelry or handicrafts.