Stone (noun)

1. A solid piece of rock or a naturally occurring substance.
2. A precious or semiprecious gem cut and polished for use in jewelry.
3. A small hard object used to throw at a target in certain games.
4. A unit of weight used in many countries, equivalent to 14 pounds (6.350 kilograms).

Origin:

Middle english, from old english; akin to old high german stan stone, latin petra rock.

Examples:

1. She picked up a stone and threw it in the water.
2. The ring was set with a diamond stone.
3. He gathered stones to build a wall.
4. She was carrying a bag of stones.
5. The doctor said that I had a stone in my bladder.