What color can the gray floor tile match with the doorstone?

Generally, gray floor tiles are matched with black doorstones, and darker colors are better. The doorstone is a stone, which is a stone doorway to solve internal and external problems. The high fork determines the transition of the two materials to block water and play a beautiful role. Generally, when choosing, we should follow the color of the ground material, but the darker color is easier to eulogize the sense of space. For example, beige tiles can choose dark brown doorstones.