Calibrated round brilliants and single cuts 

Unique pieces

Elevate your creations with our finely crafted calibrated round brilliants and single cuts, beginning from a tiny 0.40 mm and extending into large, certified round brilliants. Explore our extensive range of intriguing shapes and natural fancy colors. Let your creativity flourish with each unique piece.

Precise craftsmanship

Reflecting the character of Swiss timepieces

Our diamonds are meticulously crafted to meet the unique demands of the Swiss horology industry. Perfectly calibrated for accuracy, our round brilliants and single cuts elevate the intricate elegance, quality, and designs expected by this esteemed sector.

With an ultimate versatility in design

Available in round brilliants, a myriad of shapes, and a range of natural fancy colors, our collection surpasses traditional boundaries. From classic outlays to intricate compositions, our diamonds offer endless design possibilities.

 Our meticulous approach

Personal touchpoints

Connect with us, sharing your questions, needs, and desires, to facilitate a personal meeting. This allows us to provide bespoke advice on manufacturing methods, source countries, and the specific design you envision.

Exquisite manufacturing

As your trusted partner, we uphold unparalleled standards of quality. Every diamond undergoes meticulous craftsmanship, ensuring it not only meets but surpasses the highest benchmarks of excellence and traceability.

Seamless journey from miner to you

With an extensive distribution network and a vast supply from major mining partners, we seamlessly dispatch our diamonds worldwide, ensuring a reliable and fully traceable supply chain. At your request, our diamonds come with certificates from accredited gemological laboratories such as GIA, HRD, GGTL, and other esteemed institutes.

Gunther Willems Diamonds is synonymous with reliability and trust. Our longstanding relationships with clients and suppliers are a true reflection of our commitment to reliability.”

Gunther Willems

Did you know we manufacture based on technical plans?

At Gunther Willems Diamonds, we excel in on-demand manufacturing. Whether you’re envisioning classic elegance or avant-garde designs, our diamonds offer limitless possibilities to bring your creative visions to life.