The Taj is built of white marble, one of the hardest of all stones. The interior of the Taj is inlaid with precious and semi-precious stones such as carnelian, agate, lapis, onyx, jade, turquoise and others. The carnelian is transparent, which allows light to come through the stone and cast a pink glow. We are standing in front of some exterior inlay. A close up shows the intricacy of the floral inlays.