It's a dark grey stucco with a smooth troweled "Santa Barbara" finish.

I love the stones in the fire pit. I was told i could not use then because they would explode. see photo they rocks are in the corner off the slab, would love to use them instead of the ugly lava rock they told me i had to. its a gas pit with a circle ring inside

Hmmmm...Maybe just going with a finer textured lava would solve your problem. The big chunks are a little awkward...or consider fire glass.

was this a purchased firepit or was it poured in place?

It was poured in place.

like the modern low maintenance plants and wood/concrete contrast