While some Sightholders cut their own stones, many other rough diamonds are sold to independent manufacturing firms, primarily located in global hubs like (where roughly 90% of the world's diamonds are cut) and Antwerp, Belgium . These buyers are experts in "planning" a stone—using 3D scanning technology to decide how to cut a rough crystal to maximize its weight and clarity. 3. Professional Traders and Wholesalers
A small, elite group of luxury brands—such as Tiffany & Co., Graff, and Harry Winston—occasionally buy exceptional, "special" category rough stones. By purchasing a massive rough diamond directly, these houses can oversee the entire provenance and cutting process to ensure the final gem meets their specific brand standards for "perfection." 6. Specialized Investors who buys rough diamonds
In recent years, some private investment funds have begun buying high-quality rough diamonds as a hedge against inflation. Unlike polished diamonds, which have a more transparent market price, rough diamonds require immense expertise to value, making this a niche area for sophisticated investors. While some Sightholders cut their own stones, many
Not every diamond is destined for jewelry. In fact, about are unsuitable for adornment due to heavy inclusions or poor color. These "boart" or industrial-grade stones are purchased by companies in the tooling, drilling, and tech sectors. Because diamonds are the hardest known natural material, they are essential for industrial cutting, grinding, and polishing tools. 5. High-End Jewelry Maisons Professional Traders and Wholesalers A small, elite group
In summary, the rough diamond market is a closed loop of experts. From the industrial giants who need grit for drill bits to the master cutters in India, these buyers turn opaque, pebble-like crystals into the calibrated gems and tools the world relies on.
