Here's why:

* Bedrock is the foundation of the world: It's the deepest and most solid layer in Minecraft, and in real-life geology, it's the oldest and most stable rock layer.

* Gem formation: Gems form under specific conditions, often involving high pressure and heat deep within the Earth's crust.

* Bedrock's formation: Bedrock is primarily formed from igneous rocks, which solidify from magma. While igneous rocks can contain minerals, they are not the ideal environment for gem formation.

So, while gems are found in the Earth's crust, they wouldn't be found in bedrock.