Surat is the correct answer. It is the largest diamond cutting and polishing center in the world, accounting for more than 90% of the world’s diamond cutting and polishing industry. It is also the second largest city in Gujarat, after Ahmedabad.
Ahmedabad is the largest city in Gujarat and the sixth largest city in India. It is a major commercial and industrial center, and is home to a number of industries, including textiles, chemicals, and pharmaceuticals.
Vadodara is the third largest city in Gujarat and is known for its educational institutions and historical monuments. It is also a major industrial center, with a number of industries, including textiles, engineering, and chemicals.
Rajkot is the fourth largest city in Gujarat and is known for its leather industry. It is also a major commercial and educational center.
Surat is the most important city in Gujarat for the diamond industry. It is home to a large number of diamond cutting and polishing factories, and is the world’s largest diamond cutting and polishing center. The city’s diamond industry employs more than 4 million people, and accounts for more than 90% of the world’s diamond cutting and polishing industry.