celadon with brown mottles

例句：

1. 1. The blue gemstone is a rare and valuable mineral.
   这个蓝色的宝石是稀有且有价值的矿物。
2. 2. Celadon was once used to decorate the walls of royal palaces.
   天青石曾经被用来装饰皇家宫殿的墙壁。
3. 3.This piece of celadon is from the ancient Chinese civilization.
   这块天青石来自古代中国文明。