Custom manufacturing
on technical plan
The authentic essence of your brand
Providing diamonds for luxury jewelry and horology is an intricate craft with intricate demands. With our specialized manufacturing service, we transform your request into a unique diamond product that characterizes the authentic essence of your brand. Ranging from 1700 pieces per carat up to fifteen carats and more.
Crafting your signature gems
With unrivaled expertise
Our on-demand manufacturing is tailored specifically to the standards of the Swiss watch industry, matching the expertise of certified horology artisans. Our extensive range of key partners worldwide includes skilled craftsmen, boasting decades of experience. They ensure that each diamond is a masterpiece, crafted with precision and passion.
Beyond pure elegance
Each stone undergoes a detailed check under the watchful eye of our in-house gemologists, armed with Sortoscope® microscopes. It’s a commitment to our customers, assuring that each purity is guaranteed to align perfectly with gemological laboratory standards — and, of course, with the standards set by our clients. Going beyond mere purity, our gemologists meticulously grade each diamond for color, fluorescence, angles, girdles, diameters, proportions, symmetry, ensuring it’s cut to the exceptional standards synonymous with Gunther Willems Diamonds. And for those seeking something truly unique, we’ve got you covered with tailor-made assortments.
And natural fancy colored diamonds
What began as a passion has now evolved into a specialization. Mother Nature has crafted natural fancy colored diamonds over a billion years—a rare gem among mined diamonds, rendering them ultra-exclusive and highly coveted. Our collection is a treasure trove of fancy colored diamonds, offering an exceptional global supply for the world’s most desired colors, including pink, blue, orange, green, red, and yellow.
Calibrated round brilliants and single cuts
We offer finely crafted calibrated round brilliants and single cuts, beginning from a tiny 0.40 mm and extending into classic 8/8 cuts. Explore our wide range of shapes and natural fancy colors, specifically curated for the Swiss horology industry.
