Many people from Saurashtra, especially Junagadh, Bhavnagar and Amreli, migrate to Surat to work in the diamond industry.
Traders say nine of ten diamonds exported to the US come from India, mainly Surat.
Despite high exports, US buyers now pay 25% more after tariff hikes, and a possible rise to 50% after August 27 may force traders to raise prices.