Since 1840, the diamond house of Amsterdam. Discover natural diamonds and true craftsmanship.
Have you always dreamed of creating your own diamond jewelry? At Royal Coster Diamonds, we make this possible with our concept called 'Coster Creations'. With a choice of over 20,000 loose diamonds and various types of settings, you can create your own piece of jewelry exactly to your wishes and budget. And all of this is possible within 30 minutes, after which you go home with your dream piece of jewelry.
Welcome to our house of diamonds
As the oldest diamond cutting factory in the world, we have goldsmiths and diamond polishers working in our house of diamonds
At Royal Coster Diamonds, we work exclusively with natural diamonds of the highest quality. Each diamond is carefully selected, cut, and evaluated with the utmost precision by our experts in Amsterdam. With a collection of over 20,000 loose diamonds, we offer one of the most extensive selections in Europe. Our diamonds are certified by the world’s leading independent institutes, including GIA, IGI, and HRD, ensuring their authenticity, origin, and quality.
Whether you are looking for an engagement ring, a unique piece of jewelry, or a loose diamond, you can be certain of an authentic and lasting creation that will be cherished for generations. Discover our collection of natural diamonds and experience the craftsmanship and heritage that have distinguished Royal Coster Diamonds worldwide since 1840.
We believe that true beauty begins with responsibility. That is why we work exclusively with ethically sourced, natural diamonds from verified and conflict-free origins. Through our collaboration with the world’s leading certification institutes – GIA, IGI, and HRD – we ensure that each diamond’s origin, quality, and authenticity are fully traceable and verifiable.
Our mission is to unite the timeless art of diamond cutting with the values of today: sustainability, transparency, and respect for people and the planet. In doing so, we contribute to a future where luxury and ethics go hand in hand.
