A (round piece) can be constituted-of-or-filled-with black granite.
A circle can be constituted-of-or-filled-with (granite arches).
A centerpiece of a memorial can be a circle of (granite arches).
A pathway may be bordered by some slabs of a (granite timeline).
A composition can be constituted-of-or-filled-with black granite.
A simplicity of (granite pavers) may be laid in a (grid pattern).