First of all, let's get clear on one thing: stone scratches!

And although it is impossible to prevent scratching entirely, it can be minimized. Nothing can be uglier than a heavily scratched front entrance floor of a building. So, whenever possible, a non-slip mat should be used outside and a carpet or rug on the inside, especially where heavy traffic is common. This will help minimize damage to the stone caused by highly abrasive elements found outdoors, such as dirt or sand for example. On the inside, dust mop on a regular basis to remove unwanted particles which could also scratch the floor, and avoid dragging objects or furniture on the surface. Always dust mop before washing the floors, and when washing, use warm water with a very little amount of mild detergent. Change water frequently, rinse thoroughly and dry with a soft cloth. Hose down outdoor patios and pool/spa areas with clean water, and use a very mild bleach-water solution when needed for algae removal.