Marble. Maybe Calcutta? You can find these products at any flooring outlet or store.

Yes, I believe it's calacatta gold. I've searched high and low and I'm searching for this exact tile.

I believe it is Calacutta gold. It is a natural stone so finding the exact same color would be hard.

https://www.houzz.com/products/calacatta-gold-1x2-basketweave-mosaic-with-gold-dots-polished-from-italy-prvw-vr~79378106

Thank you all for your replies. I appreciate any help I can get! Again, I am looking for this EXACT tile. It looks like calacatta gold and some other darker marble edging each piece; these gray outlines really make the marble unique, in my opinion. The pieces are larger than normal, a 2x4 vs the more common 1x2. M&R Kitchens posted a link to a similar one, but it is smaller and is lacking the gray outlines. If anyone stumbles upon this tile somewhere I'd love to know! Thank you all again for your responses!

Try Waterworks, Ann Sacks, Walker Zanger, Artistic Tile. They all have web sites and they all carry very beautiful, high-end tile such as the one you like.