Thank you for your interest in the MSI Rustique Interlocking Slate Mosaic Tile. This tile does not require grout during installation. Good luck with you project

Thank you. Do you offer a bull nose or end piece to cover bare edges? Also any suggestions fir internal corners (cover bare edges).?

Yes there are a few options for end pieces on this stone. Please contact Houzz directly to place a special order. Another option is leaving the edges trimmed as they are to show the side of the stone. To handle corners inside or outside you can cut and overlap the tiles or miter the tiles for a flush look. We recommend using a wet saw for these types of cuts. Good luck with your project!