Gem Pedestals/Keyholes

New pedestals that act like levers would be a cool way to make doors. Making a Stone pedestal with a gem in its crafting recipe make a sort of keyhole, using a diamond, Emerald, lapis, or amethyst. Placing one of these in a pedestal sends a redstone signal. This would make for a cool dungeon experience, having to collect items as keys to proceed. These items don't have to be gems either. This would add potential for future dungeons added into the game.