At Grunberger Diamonds, we guarantee an unmatched level of precision. All of our stones meet stringent sourcing, cutting, and sorting criteria. Members of the Responsible Jewellery Council are frequently audited to ensure compliance with ethical standards, transparency and traceability. Grunberger Diamonds has consistently and successfully proven that our supply chain remains committed to open manufacturing standards. 

Here’s an overview of what you can expect from us:

Sourcing

We purchase very specific types of rough from a select group of suppliers we’ve had a relationship with for decades. This helps us know exactly what we are buying, virtually eliminating any chance that foreign or unnatural products enter our system. All of our rough come from guaranteed conflict-free sources that are in full compliance with the Kimberley Process.

Cutting

Our company is vertically integrated, meaning we do not rely on outside sources or companies through production. Unlike many other melee diamond manufacturers, we inspect, cut, and polish each stone with the same precision, all under one roof.

Click here to learn about our factory in Vietnam

As one of the first manufacturers of Ideal Cut melee with Hearts and Arrows, the Grunberger Precision Cut ® was created with the desire to bring out the best in what a diamond has to offer. The perfect homogeneity and reliability of our cut maximizes the brilliance within all jewelry pieces.

Click here to learn more about the Grunberger Precision Cut ®

Sourcing

Once out of production, an inspection team sorts our stones into more than 40 qualities. They are then shipped to our headquarters in Antwerp Belgium, where they undergo another rigorous quality control process.  Sorting teams working at our sales offices in the U.S. and Japan reinspect every single stone before we finally send them out to our clients worldwide.

Precision and consistency remain the core values encompassing Grunberger Diamonds. Over 75 years, we have grown from a small outlet in Antwerp to a global firm maintaining the highest quality in sourcing, cutting, and sales of our products. We pride ourselves on being a company that operates at the highest ethical levels in the industry and standing at the forefront of providing top quality products and service to our clients.

Here’s how to get in touch.

Hi there,

As a fourth generation partner at Grunberger Diamonds, I want to share my thoughts on where I see our industry shifting to meet the demands of today’s luxury consumers.

The June issue of Rapaport Magazine, “Spotlight on Gen Z,” did a great job highlighting changes the diamond industry must make to compete with other luxury sellers. A key takeaway from the issue: authenticity, transparency, and integrity are major factors in the buying compass among young people. For Gen Z-ers, 66% root their buying decisions in the quality of the brand along with 85% weighing heavily the authenticity. Ultimately , when it comes to diamond jewelry, the product, brand, and team all must authentic.

From our humble beginnings in Antwerp, Belgium, we’ve always stayed true to our roots. Our guarantee is authentic diamonds and through our vertical integration, our standards of quality, sourcing, and service have and will always remain at the highest level.

For John Sorich (@JohnnyOro), authenticity is at the heart of his stunning creations. We love the way he incorporates our Melee diamonds into his pieces:

We love seeing all the incredible products our diamonds become a part of — so don’t hesitate to tag us on Instagram or Facebook with your latest goods!

Sincerely,

Daniel Grunberger

Here’s how to get in touch

The public health crisis has shaken up the diamond industry, exposing vulnerabilities in global supply chain networks. And in a market where reputation means everything, you can’t risk any missteps in quality control and service.

With Grunberger Diamonds, you can be rest assured knowing you’ll always receive the best: always new; always natural; always brilliant.

From sourcing the rough ourselves to operating our own production facilities, we control all aspects of our supply chain — guaranteeing that every single diamond conforms to the highest cut criteria. It’s a promise we’ve kept since 1945.

Our rough diamonds come exclusively from a select group of suppliers we’ve had relationships with for decades. This helps us know exactly what we are buying, significantly reducing any chance that foreign or unnatural goods will find their way into our inventory. But this is not our only safeguard against synthetics. Because of our diamonds’ unique cut, it would be virtually impossible for synthetic diamonds to find their way into our inventory and not be spotted in the sorting process.

Of course, as certain as we are that these safeguards will prevent synthetics from ever entering our inventory, we do understand that nothing is better than peace of mind and extra assurance.

Back at our headquarters in Antwerp, Belgium, every diamond goes through the M-Screen+, a state-of-the-art machine that screens, sorts, and singles out stones that might be synthetic.

Learn more about Grunberger Diamonds’ M-Screen+.

Last year, we achieved Responsible Jewellery Council (RJC) Certification by meeting the highest ethical, social, and environmental standards set forth by the international nonprofit. Being a RJC member reinforces our unwavering commitment to human rights and ethical business practices.

At Grunberger Diamonds, your reputation means everything.During these trying and uncertain times, we are committed to providing you peace of mind, as well as the consistency and expert craftsmanship our clients have relied on for the last 75 years.

Here’s how to get in touch.

Four generations ago, when Grunberger Diamonds was just getting started, the war was ending, and the future was uncertain.
People still got married.

Three generations ago, nuclear cataclysm seemed imminent.
People still got married.

Two generations ago, a disease no one understood & everyone feared emerged.
People still got married.

One generation ago, hurricanes, earthquakes and tsunamis wreaked havoc.
People still got married.

And here we are today. We don’t have to explain the situation to you: you know. The globe’s united in this latest challenge. We all share the same fear. No one knows what is going to happen. People will still get married.

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People will still get married because they know that the only thing we can count on in this world is the power of love.

Faced with fears that aren’t the same – yet aren’t entirely different – than the ones our parents, grandparents, and great-grandparents faced; we’re going to react much the same way they did. We all want a hand to hold. No one wants to face the world alone.

Maybe that’s really why diamonds are ideal for wedding jewelry. Yes, they’re beautiful, yes, they’re precious, but when we get into what the defining quality of a diamond is – the factor that sets it head and shoulders above every other gemstone – it’s the diamond’s toughness. Created by intense crushing pressure, diamonds are strong enough to endure just about anything.

Just like love.

When we started Grunberger Diamonds, the circumstances of the time demanded that we be flexible and work with jewelry manufacturers and retailers so everyone could stay in business. And truth be told, that’s been the case ever since – we’re a global company, and as we all know, trouble travels everywhere. Someone’s always facing difficulties, but we’ve always been able to find a way to make it work.

And that’s what we’re going to do now. Grunberger Diamonds is absolutely committed to helping you create beautiful jewelry for your customers’ most special moments. That means no minimum order requirement on our ideal cut melee diamonds. While New York is under strict regulation and we will have a slightly longer turnaround than usual, we are still able to fill orders within 3 business days. If you need help making it happen, please, call us. Flexibility and understanding have been the key to our longevity, and we’re confident they’ll be the key to everyone’s future.

Hang in there. Love really does conquer all.