Gold blocks are bright yellow in color with a change in shading along the edges making them look beveled.
Where Found
Unlike most blocks, a gold block is not spawned in a new world and must be created in a metalwork bench. Prior to version 1.3, it was instead crafted at the furnace.
Gold blocks are useful in construction. When it is first placed, the achievement "Palace Builder" will be obtained. They are also conductive and can be used to transfer electricity through blocks.