Certified diamonds
Our diamonds are certified by leading institutes such as GIA, IGI, and HDR.
Craftsmanship
With 185 years of craftsmanship, we are the world’s oldest diamond polishing factory.
Location
Located at Museumplein in Amsterdam, with parking facilities available

Your diamond, your choice

Imagine holding a diamond before it becomes part of a jewel. At Royal Coster Diamonds, you have the opportunity to handpick your own loose diamond from Europe’s largest collection — over 10,000 certified stones. Each diamond is carefully selected by our GIA-certified experts and graded by the world’s most trusted institutes, including GIA, IGI, and HRD.

During your private consultation, our diamond specialists will guide you through the 4C’s and help you find the stone that truly reflects your personal taste. Whether you wish to create a bespoke engagement ring, a timeless pendant, or another special piece, your chosen diamond will form the heart of a design made just for you.

Book your appointment below and enjoy 25% off your loose diamond.

Crafted to brilliance

At Royal Coster Diamonds, craftsmanship and tradition come together to create brilliance. Our signature cut, the Royal 201, embodies this mastery — with 201 precisely cut facets, it reflects light unlike any other diamond in the world. Not every stone is worthy of this title, but under the guidance of our experts, you can discover what makes a diamond truly exceptional.

Ready to find your perfect diamond? Book your appointment today and take advantage of your exclusive 25% discount.