 Last year, the country’s import of rough diamonds rose 24.5 percent to 149.8 million carats against a year earlier, and export of cut and polished diamonds witnessed a surge of 28.3 percent to 59.9 million carats.The old market is located at Opera House and Prasad Chambers (Charni Road).The cutting and polishing of diamonds occurs mainly in the city of Surat, which is also known as 'Diamond City'.