Phra Sri Rattana Chedi
This is situated behind the Mondop on the same base. King Rama IV ordered its construction in order to house a Buddha relic. His original plan, as mentioned above, was that the Emerald Buddha would be rehoused in Prasat Phra Thep Bidorn, with the Mondop housing the Buddhist scriptures behind it and this stupa at the back, thereby echoing the classic arrangement of stupas in a straight line which had been characteristic of Buddhist architecture since the Sukhothai and Ayutthaya period.
The bell-shape of the chedi is based on the larger ones at Wat Phra Sri Sanphet in Ayutthaya. On each of the four sectors of the circular base are four protruding porches allowing access to the interior. Miniature chedis are placed on top of the porches. The chedi is covered with gold mosaic which was added by King Rama V and was originally ordered from Italy. The mosaic has recently been replaced.