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We guarantee that all diamonds supplied by costco.co.uk are as follows: Clarity to be VS2 or better and colour to be "I" or better as outlined on the industry grading guide.

Costco makes purchasing quality jewellery easy by offering only the industry's highest quality diamonds at the lowest possible price. Costco's experienced buying team works with our suppliers to select timeless styles and create well–crafted and comfortable jewellery. An Independent Gemologist inspects each piece for quality craftsmanship and every diamond for cut, colour and clarity to ensure your jewellery will sparkle for generations.