Yogo sapphire is a very special type of gemstone that comes from a place called Montana in the United States. It is a very pretty blue color that is really shiny and sparkly.
Sapphires are a type of rock that are made up of a special material called corundum. Yogo sapphires are found in a special area of Montana where the rocks are really old and have been there for millions of years.
Yogo sapphires are special because they are mined in a way that doesn't damage the environment very much. People who want to find yogo sapphires have to dig really carefully and use special tools so they don't hurt the rocks around the sapphires.
Once they are mined, yogo sapphires are polished and cut into pretty shapes that people can wear as jewelry. They are very valuable because they are rare and really pretty. People who have yogo sapphires can pass them down to their children and grandchildren as a special family treasure.