Create the First Diamond Pattern Layer

What happens here

After the border is established, begin laying the first layer of the internal decorative pattern. This involves placing a combination of dark grey square pavers and light grey triangular pavers. The dark square pavers are laid in a grid, and the triangular pavers are used to fill in the spaces around them, forming a diamond shape at the center of the pattern.

Goal: Form the initial part of the central decorative diamond design.