Alain Vandenborre stands in one of his high-security vaults in the basement of the Singapore Freeport. He is showing one of the diamonds, worth $300,000, from his collection. Mr. Vandenborre is one of the co-founders of the Singapore Freeport and currently the head of the Singapore Diamond Exchange. Many major companies are based at the Singapore Freeport, including Malca-Amit, Christie’s, Deutsche Bank and Brink’s. Singapore