The sapphire is a new item that was added only to trade with alien villagers. It should have more uses. All the other materials have their tools and blocks, why not do the same with sapphire? It's kinda wasteful to add an item only to be used for 1 task and nothing else. The sapphire should at least have its own block, for storage and decoration purposes. If the sapphire is good enough, it should also have its own tools, weapons, and armor. The emerald in vanilla Minecraft is used only to trade villagers, but at least it has its block for storage and decoration. The sapphire should have more of a purpose than it does now.