Theresa sold jewels made of scrap metal, beach pebbles, antique glass and anything she could lay her hands on, and make beautiful.
We need stones, said Gaia. Many, black and white.
What for? Are you looking to make a necklace?
No, we need stones to play a board game we have invented. Stones should have the same size.
Well, there are no two stones of the same size on earth. Are you sure you want to use stones?
Gaia nodded.
How many do you need per color?
A thousand.
Let me look at what I have, Theresa said and disappeared behind a curtain.
The store had an oval table in the center, on which earrings, bracelets and necklaces were on display. Resin enveloped fabric, fragments of photos or painted images. Stones of all shapes were trapped in color metal casings resembling unfamiliar animals, or flowers, or odd machines.
Gaia tried a bracelet on. It was made of bright, red stones, copper wire and antique glass beads. Julia beamed at the sight.
Here’s what I have, try those, said Theresa carrying two large pouches. She opened both on the table and let a number of stones fall out, round, white and black pebbles.
The sea tumbled them smooth. Some are larger than others, none exactly the same. Is that what you need?
helobiae 
Wow, this is such a cool idea. Loving it. Thanks for sharing!