She is turning yellow isn't she? They chose Indian marble as the core material to built the Taj Mahal. Being the third hardest natural resource in the world, the Indian marble tends to turn yellow after a while. I heard that the Greek marble stays white for a longer periods of time. That was one of the many reasons why the Greek marble was used to construct the Lotus Temple in New Delhi. I could not see a single cloud formation for miles. This was the perfect setting for the Taj Mahal as the sun rose to define the detail facade of the Taj Mahal against the simple white washed blues skies.