Being the only SGS-verified intermediary in the industry, complete discretion and transparency for the seller are ensured. Sales cycles are based on the diamond industry calendar of events in order to benefit fully from market momentum. Pre-screening and due diligence are conducted on all participants and a solid sale process methodology is followed.

Our dedicated staff, most with over twenty years of experience in the industry, handle all logistics such as: participants' screening, invitations and room allocations schedule, insurance and import/export of goods, boiling and weight reconciliation, parcel preparation and labelling, invoicing and collection of sales proceeds. A customised bar-code-based software is used for stock management and to track viewing history.

The bidding process is conducted under the supervision of a bailiff on a dedicated password protected online platform - www.bonasbids.com - which, after the closure of the sale, automatically analyses all bids/entries and generates sophisticated reports for the seller.




Bonas Large Stone tender - Antwerp viewings:

- 22 - 26 October (26 October 3pm)

Braúna mine


Braúna - Antwerp viewings:

- 12 - 22 November (23 November 1pm CET)

Lucara Diamond Corp : Karowe mine

Karowe - Botswana only viewings:

- 3 - 13 December (13 December 4pm CET)

Mountain Province: Gahcho Kué mine

 Gahcho Kué - Antwerp viewings: 

- 24 October - 13 November (14 November 3pm CET)

- 3 December - 13 December (14 December 3pm CET)

Namakwa Diamonds: Kao mine

Kao - Antwerp viewings:

- 26 November - 6 December (7 December 3pm CET)

Stornoway Diamonds: Renard mine

Renard - Antwerp viewings:

- 9 - 19 October (22 October 3pm CET)

- 19 - 29 November (30 November 3pm CET)

    * Subject to change


If you wish to schedule an appointment, please contact our Antwerp office at:
+32 (0)3 233 70 80
diamondbrokers bonasgroup com


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