What is the average size of each stone?

The average size of stones can vary widely depending on the type and context. For example, gravel stones may range from 1/8 inch to 2 inches in diameter, while larger landscaping stones can be several feet across. If you're referring to specific types of stones, such as gemstones, their sizes can range from small chips to several carats. For a precise answer, more context about the type of stone in question is needed.