Imports In 2015, British Indian Ocean Territory imported $6.07k in Monumental or building stone nes, porphyry and basalt, becoming the 0th largest importer of Monumental or building stone nes, porphyry and basalt in the world. At the same year, Monumental or building stone nes, porphyry and basalt was the 0th most imported product in British Indian Ocean Territory. British Indian Ocean Territory imports Monumental or building stone nes, porphyry and basalt primarily from: N/A.