Botswana is mounting an aggressive international campaign to defend the natural diamond industry as lab-grown alternatives capture a growing share of global markets and threaten the country’s primary revenue source.
The southern African nation, the world’s largest producer of diamonds by value, is coordinating with regional governments and industry partners to draw a sharp distinction between mined gems and synthetic stones, as the pace of market disruption accelerates. Synthetic diamonds had captured approximately 20 percent of the global market by value and up to 50 percent by volume in the United States engagement ring segment in 2025, according to ratings agency S&P Global, which cited the rapid expansion of the lab-diamond market as a key factor in dropping Botswana’s long-term credit rating one notch to BBB with a negative outlook.
Lab-grown diamonds now cost about 73 percent less than natural diamonds and account for more than 45 percent of all United States engagement ring purchases, fuelled by improved manufacturing efficiencies and shifting consumer preferences, particularly among younger buyers.
Botswana’s Minister of Minerals and Energy Bogolo Kenewendo has led the country’s pushback, taking the campaign to major industry platforms. At the JCK diamond show in Las Vegas, the world’s largest gem trade event, she was direct about the industry’s position, saying synthetics “belong at the bottom of the drill” rather than alongside natural gem-quality stones.
Angola, Botswana, Namibia, South Africa and the Democratic Republic of Congo pledged to allocate one percent of their annual diamond revenues to marketing natural diamonds, with the campaign aimed at reframing mined stones as coveted luxury products with a development story attached.
Botswana also secured a significant regulatory win when it successfully lobbied against a proposed universal grading system that would have placed synthetic and natural diamonds on an equal footing. The Gemological Institute of America (GIA) officially reversed plans to impose universal grading across both categories following Botswana’s intervention, preserving a key differentiator between the two product types.
De Beers, which participates in the campaign, announced the closure of its Lightbox unit, where it had been producing lab-grown diamonds for jewellery, signalling the industry’s commitment to concentrating synthetic diamond applications in industrial and technological uses rather than gem jewellery. Botswana and De Beers have also signed a 10-year deal to fund global marketing efforts, drawing on the industry’s long history of brand-building to reassert the emotional and cultural value of natural stones.
The campaign operates against a difficult structural backdrop. Lab-grown diamonds have exploded to capture nearly 20 percent of the global jewellery market, with prices up to 80 percent cheaper than natural stones, sending shockwaves through Gaborone. Production capacity, particularly in China and India, continues to expand, keeping downward pressure on synthetic prices and widening the cost gap with mined gems.
Industry analysts caution that reversing the trend will require sustained effort. One analyst described diversification as “essentially now or never,” warning that nothing points to a monumental shift back in favour of natural diamonds to curb the rising popularity of synthetic alternatives.
