Daltile Xpress Mosaix Perfect-Fit Coastal Marble 11 in. x 18 in. Marble Diamond Geometric Mosaic Tile (13 sq. ft./case) ST53DGMTRMSCCHN - The Home Depot
Elida Ceramica White 12-in x 12-in Honed Natural Stone Marble Diamond Floor and Wall Tile (0.96-sq. ft/ Piece) in the Tile department at Lowes.com
Carrara White Marble 2x3 Illusion 3D Cube Rhombus Diamond Hexagon Mosaic Tile w/ Bardiglio Gray Honed - Stone Center Online
Diamond Shaped Tile for Floors & More | The Tile Shop