David Johnson: De Beers charts cautious Angola return amid industry transformation

De Beers is rebuilding its presence in Angola through government partnerships and community engagement, marking a strategic comeback following its difficult exit years ago from the diamond-rich nation. However, De Beers spokesperson David Johnson cautioned...

24 november 2025

Maria Krasnova: Colored gemstones are a serious investment

Maria Krasnova, Executive Director of the renowned company “Samotsvety ot Sokolov” (Gems by Sokolov), spoke to Rough&Polished about the Gemstone project aimed at selling precious stones, as well as about current market trends, new challenges...

17 november 2025

Forging a new legacy: Tshenolo Ntshekang on building a black-owned diamond beneficiation business in South Africa

In an industry historically defined by limited access and foreign dominance, Tshenolo Ntshekang is carving a new path. The founder of Banzi and Karolo Projects, a black-owned diamond beneficiation business, Ntshekang, represents a growing wave of...

03 november 2025

Mahiar Borhanjoo returns to ‘The Heart Of The Diamond Business’

Having started his career in the diamond trade at De Beers in London, Mahiar Borhanjoo returned to the diamond giant last year as Chief Commercial Officer after working for a decade for other diamond companies. Mahiar explains why he returned to De Beers...

27 october 2025

Mubri president Ali Pastorini: You just need to play a transparent game and do everything possible to attract clients

Ali Pastorini, co-owner of the DEL LIMA JEWERLY and president of the Mubri International Association, which unites more than 2,500 wholesalers, retailers, and designers from 18 countries. In this interview with Rough&Polished Ali Pastorini talks about...

20 october 2025

Diamond tenders and auctions are opaque and inefficient, HB Antwerp says

23 september 2025

Diamond sales procedures should be revamped to do away with outdated practices, Reuters reported with a reference to HB Antwerp co-founder and managing partner Oded Mansori.

According to him, to survive the current price slump, diamond producers should change their perception of diamond tenders and auctions which are opaque and inefficient.

"For years, miners relied on tenders and auctions, systems that look efficient on paper but in practice resemble a casino," Mansori said in a statement.

"Rough stones are pushed into opaque markets where value is anyone's guess. When global demand softens, as it has in cycles over the last decade, producers are left exposed. Workers pay the price, while shareholders watch assets decline."

Mansori, added that producers' revenues should be tied to the eventual polished value of its stones "rather than gambling on rough sales in opaque auctions".

HB Antwerp buys special rough diamonds (+10.8ct) from Lucara Diamond. Companies signed a diamond sales agreement in 2020, which was renewed for a further 10 years in 2022. HB Antwerp accounted for 72% of Lucara's $74-million diamond revenue in the six months to June 30, up from 65% the year before.

In late 2023, Mansori left HB Antwerp to return to the company just a month later. Around the same time, Lucara ended its supply contract with the manufacturer, but reinstated the agreement a few months after Mansori’s return. The split with Lucara also caused the government of Botswana to pause a proposed deal with HB Antwerp to acquire a 24% stake in the manufacturer’s business.

Theodor Lisovoy, Managing Editor, Rough&Polished