The online jewelry retailer in the United States has a product line that includes diamonds, wedding rings, and jewelry, but its flagship product is very clear - diamonds. The success of Blue Nile lies in the complete transparency of its sales - it has uploaded detailed information and pricing information of over 50000 diamonds online, resulting in an average price that is approximately 20% lower than the industry, and even up to 40% lower. At the same time, each diamond undergoes independent quality appraisal and certification to achieve superior quality.