Correct option is B
The Indian Diamond Institute (IDI) is located in Surat, Gujarat. Surat is a major diamond processing and polishing center and is known as the diamond hub of the world. Nearly 90% of the world’s diamonds are cut and polished in Surat. The IDI was established to provide specialized education and training in diamond grading, cutting, polishing, and jewelry designing. It also plays a key role in promoting research and technological advancements in the diamond and gem industry.