Royal Coster Diamonds and GASSAN Diamonds together make up ‘Amsterdam City of Diamonds’.

Royal Coster Diamonds
Paulus Potterstraat 2-6, Amsterdam
T: +31(0)20 305 5555
www.costerdiamonds.com

GASSAN Diamonds
Nieuwe Uilenburgerstraat 173-175, Amsterdam
T: +31(0)20 622 5333
www.gassan.com