Program aims to educate young consumers about mined stones’ positive qualities.
Higher price of gold and reduction of store network contributed to first half’s estimated jump.
Jeweler had previously expected to shut half that number.
Dubai-based Gaston International, which Dev Shetty founded, buys Lulo deposit and all other assets.
Lower-grade ore also hindered earnings, as miner had less supply to sell in second quarter.
Angolan exploration area is part of company’s joint venture with state-owned diamond miner Endiama.
Indian retailer also says diamond business picking up.
Bonas will offer over 900 lots from Botswana, Canada, Lesotho, Angola and more.
First-half sales fall 30% year on year amid slump in China and rising popularity of lab-grown.
Miner sold Seriti diamond in second quarter for an initial value of $12 million.
Hit comes amid lower overall prices and fewer goods on offer.