Minecraft wiki entry for Diamond, associated text: Unlike in Minecraft, newly mined diamonds in real life are rough, cloudy stones. The largest, purest ones are polished into crystal-clear gemstones, while the rest are used in industry for cutting and grinding.
Although diamonds themselves are not renewable, all tools, weapons, and armor made from diamonds can be acquired through trading, and are therefore renewable. Other items crafted from diamonds are not renewable.
In the April fools version Java Edition 2.0, diamond chickens can lay diamonds. This does not exist in newer versions, as this was a joke.
The item forms of diamonds and turtle eggs have the same shape.