More variety for the shield

First off I would like to say that we've seen a new armor in the game but not a new shield, so I thought would it not be a great deal for us fell pvp players, and PvE players to have a better defense, rather then just putting unbreaking on there shield. The upgrade could be basic tiers with ores like an stone, iron, gold, and diamond shields. For more details the stone, iron shield would have mor durability but block a little slower, the gold and dimond shield would block quicker and cover more defensive area for the player, but the gold shield just like its tool variant will not last that long.