Luxor 2

You might read this achievement and go "100, oh geez, I better get going on this one". nah. Even if you specifically don't try to catch them, you'll probably have this by level 9-1. The game is a little generous and makes the pieces "move" a little next to you if you're close.
If you're wondering what the gems and jewlery are just play the first level. When you finish some chains/make a nice combo/beat a level some stuff will fall out of the sky that looks gold. If it lands on your "shooter" you get bonus points.
It's just one of those achievements you'll get while playing without having to think about it, so don't worry about it.

When the pieces are falling from the sky after you blow up the balls and such that are coming by just collect them, you will have more then enough time to collect the 100 jems by the end of the game.

Any Questions, Just send me a message
GT: xGodDogx