i have this rock how can I know if its diamond?
i scratched on the window and it made a really big one and deep one. i scratched it on the mirror, also did the same. there are lil crystals on each sides of the rock (shiny) i also looked this up and it looks almost the same or maybe nearly. http://www.earth.ox.ac.uk/~oesis/rocks/medium/ign3a-m.jpg
and another question
i also have a diamond and i tried to put it in a bowl of water (2gallons) and it sunk in a second. does this prove anything?