The exterior decorations of the Taj Mahal are among the finest in Mughal architecture. The Taj Mahal was constructed using materials from all over India and Asia. It is believed over 1,000 elephants were used to transport building materials. The translucent white marble was brought from Makrana, Rajasthan, the jasper from Punjab, jade and crystal from China. The turquoise was from Tibet and the Lapis lazuli from Afghanistan, while the sapphire came from Sri Lanka and the carnelian from Arabia. In all, twenty-eight types of precious and semi-precious stones were inlaid into the white marble. (Wikipedia).
It was fascinating to visit the mausoleum in Agra. Built in white marble between 1632 and about 1643 by order of the Mughal emperor Shah Jahan in memory of his favorite wife Mumtaz Mahal.