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For more than 400 years, Amsterdam has been known as the City of Diamonds. The special grinding techniques have been passed on for generations. The diamond cutters and polishers of Amsterdam over time perfected the now world-famous Amsterdam Cut. Therefore Gassan Diamonds is proud to present the next step to perfection: the Gassan 121. This breathtaking diamond cut constitutes 121 facets, which result in optimal reflective properties. Book a free tour and experience the thrill of this amazing cut.