For natural stone, there is no two pieces are same to each other in the world, but that is what we want, we call it “natural beauty”. When we deliver a big amount of order, we will do assembling in factory before hand, we lay them out piece by piece to check the color changes, in this way, even there is some changes, we will minimize it. We will put similar colors to each other, and label them. In this way, even the colors change, its very smooth and gradual.