Why won't i get gold from crushing the stones of gold in minecraft pe?

You need a pick axe to mine any kind of stone.

To craft a pickaxe in Pocket Edition, you're going to first need to punch some trees. Get at least 3 or 4 logs, then go into your crafting menu (hit the "…" in your inventory, then tap "Craft") and craft these into planks. You're going to want to make a crafting table and a set of sticks as well. Place the crafting table, and just tap it to use it. From here, you should be able to craft a wooden pickaxe with 3 wooden planks and 2 sticks.