At Coster Diamonds you are assured of a wide-ranging collection, top quality and optimum service. We have, for instance, the largest collection of stones larger than 1 carat in Amsterdam, and we can adapt or design your jewelry fully in accordance with your own wishes. We carry out all processes in house: from cutting rough material to polishing and sorting for purity and quality. And our diamonds have generally been certified by the Gemological Institute America, the international umbrella organisation for gemstones.
