Costco makes purchasing the highest quality diamonds easy by offering only the industry's highest quality diamonds at the lowest possible price. Our long-standing relationship with our suppliers guarantees we get the best selection at the best value. Costco's experienced buying team works with our suppliers evaluating and hand-selecting each diamond for its quality and brilliance. Our team of Graduate Gemologists then inspect every diamond to ensure it meets the strictest quality standards in the industry in cut, color, clarity, and craftsmanship. You can be confident your purchase is as special to us as it is to you.