Measuring the Volume of an Irregular Shape Solid Matter Based On the Archimedes Theory

This experiment is based on the Archimedes theory:

Archimedes was a Greek philosopher. One day the King ordered a gold crown from a goldsmith. He wanted to know if the goldsmith had cheated him, so he asked Archimiedes to find out. Archimedes found out the answer  when he went for a bath. The water overflowed when he jumped in. So he dipped the King's crown and a lump of gold with the same weight of the King's crown into the water. He found out that the lump of gold overflowed much more water than the King's crown, so he knew that the goldsmith had cheated the King.

I have a science experiment checking the mass of 4 stones, based on Archimedes's theory.

 These are the materials.
- A cup of water.
- An empty cyllinder.
- 4 different shapes of   stones. (numbered from left to right: 1st, 2nd, 3rd, 4th)



First, I fill the cyllinder with water until 10 ml. The picture at the left is one of the stones that's going to go inside the measuring cylinder.

This is the stone in the cylinder:

And this is the data:

1st stone's volume is 3 ml (when it is dipped the water level becomes 13 ml)

2nd stone's volume is 1ml  (when it is dipped the water level becomes 11 ml).

3rd stone's volume is 3 ml (when it is dipped the water level becomes 13 ml.) 

4th stone's volume is 3 ml (when it is dipped the water level becomes 13 ml)


My conclusion is: we can easily measure an irregular shape solid matter based on the Archimedes Theory by using this method.