Daniel Grunberger

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 world’s most beautiful diamonds are those that are sourced in a way that respects the planet and the people who live on it. Over the years, we’ve taken extensive steps to ensure that the Ideal Cut melee diamonds we produce are beautiful in every way. We enjoy end to end control of our supply channel – sourcing the rough ourselves, operating our own production facilities, and selling directly to custom jewelers and jewelry manufacturers without involving any middlemen or third parties.

Now we’ve taken the next step and achieved RJC Certification. The Responsible Jewellery Council helps companies of all sizes, throughout the jewelry supply chain meet the rising ethical demands of peers, consumers, financial institutions, and civil society. Our certification means that we follow the RJC “Code of Practices”, a set of standards that pertain to human rights, environmental concerns, and other ethical concerns associated with fine jewelry production. It is through responsible sourcing and supply chain due diligence that the entire jewelry industry can improve, and we’re very proud to be part of this movement.

Demands for Ethical Diamonds are Changing the Jewelry Industry

Grunberger Diamonds is the world’s largest producer of Ideal Cut Melee Diamonds. This means the stones we deal in are very, very small. Given the size of our product, why do we care so much about how it’s produced?

First and foremost, we care because it’s the right thing to do. In this world, we are always faced with the opportunity to make choices. From our earliest beginnings in the 1930’s to the present day, we have always strived to run our business in the most ethical way. The reason we maintain end-to-end control of our diamonds is to eliminate risk to our customers, lower costs, and ensure a higher degree of quality control. We want our customers to be magnificently proud of the jewelry they create using our diamonds. That’s only possible when they know the diamonds are sourced responsibly.

RJC Certification also reinforces the value of real diamonds, which is increasingly important as lab-grown stones gain market share. To learn more about RJC certification, visit: https://www.responsiblejewellery.com/