How do sightholders purchase diamond rough?

Sightholders purchase diamond rough primarily by attending invitation-only trading events, known as 'sights.' These events are specifically tailored for sightholders, who are companies that have established long-term partnerships with diamond producers, particularly De Beers. During these sights, sightholders are presented with a selection of rough diamonds to choose from, and they have the opportunity to purchase based on their needs and the agreed-upon terms.

This exclusive format allows for a controlled environment where trusted partners engage directly with the producers, facilitating ongoing relationships and ensuring a level of quality and reliability in the transactions. It is distinct from platforms like auctions or public sales, which do not offer the same level of partnership and trust that characterize sightholder transactions. Therefore, attending invitation-only trading events is crucial for sightholders to acquire rough diamonds effectively.