Jason D. Hawkes and Stephanie Wynne-Jones (2015), India in Africa: Trade goods and connections of the late first millennium, L’Afrique Orientale et l’océan Indien: connexions, réseaux d'échanges et globalization, Journal: Afriques, Volume 6 (June 2015), Quote: " The Periplus of the Erythraean Sea, and the Sanskrit Mricchakatika both refer to the jewels made in Ujjain. The evidence from excavations at Ujjain itself, as well as that from surrounding villages, supports this identification. These workshops fed the main market for international trade at the city port of Baruch, at the mouth of the Narmada, which has long been recognized as the main coastal port of the early first millennium. At some point in the mid to late first millennium AD, the center of lapidary workshops appears to have moved from Ujjain to Limudra, and the main port shifted to Khambhat. Exactly when this shift took place and why it occurred is unclear. What is interesting, however, is that throughout the first millennium AD there was a clear and close spatial association between 1) source areas, 2) production centers, and 3) ports connected to the Indian Ocean."
