Bonas Group

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Bonas is the world’s longest established diamond brokerage and consultancy firm.

More recently, it has also become the largest global independent diamond and gemstone tender and auction house.

11/09/2026

Sri Lankan Cut & Polished Sapphire Tender

Bonas Group is pleased to announce a new tender featuring exclusively Sri Lankan polished sapphires, offered as both single stones and calibrated parcels.

🗓️ Monday 19 - Friday 23 October 2026
📍 Bangkok, Thailand

For more information, please email
[email protected] or [email protected]

03/07/2026

From Paraiba blues to Mozambique ruby reds — discover the full spectrum of colour at Bonas Group’s Tutti Frutti coloured gemstone tender.

📍 Bangkok | 13–16 July

30/06/2026

1,000 invoices.

Every invoice represents a client’s trust, a project completed, and a relationship built along the way. It’s a simple metric, but behind it lies a story of consistency and dedication.

Thank you — to every client and partner who has been part of this journey so far.

21/05/2026

INVITATION - Bonas Group would like to invite you to Potentate Mining’s Montana Sapphire tender, featuring a run-of-mine production from the USA. Viewings will take place in Office 1802, 18th Floor, Vorawat Building, Silom Road, Bangkok, Thailand from Thursday 25th June 2026 – Saturday 27th June 2026.

For more information, please contact:
Tim Denning: [email protected] (+44 7930 333977)
Cyrille Djankoff: [email protected] (+44 7521 021746)
Karina: [email protected] (+66 85 921 3809)

We look forward to seeing you in Bangkok.

08/04/2026

On World Diamond Day, we celebrate the journey of natural diamonds — from mine to market.

At Bonas Group, we are proud to play our role in this journey, connecting producers and clients with transparency, expertise, and over 75 years of heritage in Antwerp.

A day to recognise the value, rarity, and enduring story behind every natural diamond.

FromMineToMarket

17/02/2026

SAVE THE DATE: Belmont Rough Emerald Tender

Bonas group is pleased to announce a new Belmont Rough Emerald Tender:

🗓️ Viewing dates: 21-27 April 2026
📍Viewing location: Bangkok, Thailand

From the heart of Minas Gerais in Brazil, Belmont Emerald Mine produces premium quality rough emeralds, combining natural beauty with responsible mining and traceable origin.

30/09/2025

We’re proud to announce our appointment as the exclusive sales and marketing agent for the Williamson diamond mine in Tanzania. The Williamson mine is owned by Pink Diamonds in partnership with the Government of the Republic of Tanzania.

This partnership marks a new chapter for the Williamson mine — one of the most storied and historic diamond mines in Africa, and among the longest-running active kimberlite operations worldwide — as it continues to deliver rare and exceptional pink diamonds alongside a variety of other high-quality stones, to the global market.
Under this agreement, Bonas Group will oversee the sales and marketing of all production from the mine, bringing its unmatched expertise, global network, and innovative sales platform to maximize market access and value creation.

“We are honored to partner with Pink Diamonds and the Tanzanian Government to bring the unique and historic production of the Williamson mine to the international market.” said Philip Hoymans, Managing Director at the Bonas Group. “Our extensive experience and global reach will ensure that Williamson’s production is presented to the market with the visibility and care it deserves.”

A first tender sale is scheduled to take place in Antwerp from 13-17 October 2025.

04/09/2025

SAVE THE DATE: BELMONT ROUGH EMERALD TENDER

Bonas Group is proud to announce Belmont’s second emerald tender of the year 2025!

Viewing Dates:
4th - 10th November 2025

📍 Viewing Location:
Bangkok, Thailand

Discover premium-quality rough emeralds sourced directly from Belmont’s state-of-the-art, eco-friendly mine in Itabira, Minas Gerais, Brazil.

20/04/2025

Bonas Group and Belmont Emeralds are delighted to announce the date of the first emerald tender of 2025.
Viewings will be held in Bangkok from 21st till 25th of April 2025.
Closing date is at 25th April 2025.

About the Belmont Emeralds:
Located in the city of Itabira, Minas Gerais state in Brazil, Belmont Emeralds is among the largest and most modern mines for precious gems in Brazil. The mine has become a reference in the industry for its practice of conscientious, ethical and sustainable mining, from end to end. The Company supports and runs a number of programs to promote environmental education and the social development of the communities near the mining area.

Adres

Pelikaanstraat 62
Antwerp
2018

Telefoon

+3232337080

Website

https://www.bonasgroup.com/

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