The rough diamonds are first sorted by size (carat weight) and then each size faction is sorted into quality ranges, depending on each stone’s colour and clarity. High quality larger stones or coloured stones are sold as single lots.
Individual mine production is kept separate, providing buyers with an additional level of knowledge about the goods they are purchasing based upon each mine’s unique diamond characteristics.
Tenders last between four to six working days, during which participants view the assortments in Antwerp + place a confidential electronic bid on the parcel of their choice.
At the end of the tender, the highest bidder wins the parcel.
Coming Tenders 2022
SKA 1 (will inform soon)