The magician shows the spectators a little black stick. He shows both sides, to show that they are both blank. He rubs the end and a small yellow diamond appears! Furthermore another diamond appears on the other side of the stick! After another rub, two diamonds are on each side of the stick!
The diamonds can be moved up and down on the stick and will disappear from the stick. The last diamond becomes ten times bigger in a second!
Everything can be examined immediately!
Bonus Extra Effect
The yellow diamond on the stick changes to blue, then red! Make the colors change on both diamonds on both sides, and then with a magical move make the colors match on both sides.