Hamtaro: Ham-Ham Heartbreak/Rocks and gems

There are 2 types of rocks: tiny round ones and big flat ones. Later in the game the Rubrub room will be unlocked. This is where you can rub (polish) the rocks.
 * After being polished the rock will become 1 of 5 things:
 * Nothing
 * A sunflower seed
 * An acorn
 * A lv1 gem
 * A blue rock

If the rock turns blue then that is a good thing. This means the gem in the rock is a higher level than 1. These are rare. You will have to polish this rock again to find out what fancy gem inside is. *Note: The love meter will change color when it goes up a rank.