Koh-I-Noor Diamonds

About us

From rough to refined, since 1980.

Who we are:

Four generations of craftsmanship. In the heart of Amsterdam.

Koh-I-Noor, an Amsterdam family business with deep roots in the Jordaan neighborhood, located on the iconic Muntplein. Since 1980, we have been cutting, designing, and selling loose natural diamonds and handmade jewelry.

What began with the passion of founder Dirk, who learned the craft of diamond cutting at the age of 17, has now grown into a fully-fledged jewelry house with four generations of expertise. With us, you're not just buying a piece of jewelry—you're investing in a story, craftsmanship, and lasting beauty.

Whether you order online or visit our store, we ensure a personal and reliable experience. Handmade with confidence, style, passion, craftsmanship, your size, love. Genuine diamonds, fairly cut. Our diamonds are 100% natural and conflict-free according to the Kimberley Process. Certified, inspected, and transparent. Sustainable gold, timeless design. We work exclusively with real gold: yellow, white, or rose gold that doesn't tarnish. Combine this with modern or classic styles—for a piece of jewelry that will last for generations.

Whether you shop through our website or visit us at Muntplein, you'll receive the same personal attention, honest advice, and expertise. That's our promise. Our mission is to make the beauty and power of real diamonds accessible to everyone—with sustainable materials, transparent pricing, and genuine service. Starting in our own diamond cutting facility, we now bring the entire process together: from rough diamond to sparkling final result. Because a diamond isn't a trend. It's a story. And it starts with us.

What our customers say.

Jack:

Skilled staff, pleasant and friendly approach, ultimately finding an engagement ring relatively quickly. My girlfriend (now fiancé!) is also very happy with it.

Caroline:

I previously visited the physical store in Amsterdam, and now I had a ring custom-made online with the same attention and quality. Emails are answered very quickly and with a personal touch. Kudos!

Albert:

Fast and free delivery! They delivered it personally because I lived near Amsterdam; they were reliable people. My wife is also very happy, highly recommended!