Firstly print the Minecraft diamond template on the T-shirt transfer paper with an ink printer.

Secondly, iron the white cotton fabric so it has no wrinkles.

Then put the template facing the fabric and iron it at full power for 3 minutes applying pressure. Let it chill.

Now cut out your diamond with scissors and stick the diamond on the cork board using mod podge.

Finally cut the cork board without a template on top so the cork board fits the diamond perfectly.