Backspash looks like natural free form slate....with small glass tiles on either side. Probably would hide stains from the cooktop too...if sealed properly.

It's a slab of green marble or granite - Same as the countertops - flanked by iridescent glass mosaic tiles.

The glass is Oceanside Glasstile, Tessera Random modular pattern in the color Cane iridescent.

We are also a Supplier of Custom Handmade glass mosaic patterns. MEC guarantees you the best quality and lowest cost. We do custom designs as well, if you have your own designs just send us for free estimate. We also have other brilliant ideas which we can share with you. We are shipping this Worldwide for various projects. See our photos and please contact us for more information:
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Does the granite behind the stove project out further than the tile on the other portions of the wall?