Rain flower stone, a kind of natural agate stone, is also called ornamental stone or lucky stone.She is regarded as national treasure, and produced mainly in Luhe, Nanjing city.

• 雨花石是一种天然玛瑙石，也称观赏石、幸运石，被誉为天赐国宝、中华一绝，主要产于南京市六合区一带。