The tile is a carerra marble mosaic. Since we were not responsible for the flooring of this particular house, we do not have the exact specifications.

It looks to be a square mosaic. Most likely a 5/8" square with a Nero Marquina 5/8" square added as inserts to create the black accents. At the Builder Depot we sell both. Carrara Bianco 5/8" Honed Mosaic for $11.75SF: http://www.thebuilderdepot.com/cbh5858mos.html

And Nero Marquina Mosaic for $11.45SF: http://www.thebuilderdepot.com/black-marble.html

You may also try and be a little more adventurous a Pennyround will create a similar look just a different take to the traditional square mosaic look. Both look great.