South African billionaire Johann Rupert built his fortune selling luxury goods to some of the world’s wealthiest consumers.

Yet one of the most successful investments linked to his family’s fortune over the last decade has been remarkably simple: gold.

Long before artificial intelligence became Wall Street’s favourite trade and years before geopolitical tensions sent investors scrambling for safe-haven assets, Rupert’s investment vehicle quietly bought into the world’s largest gold exchange-traded fund.

More than a decade later, that decision is paying off.

According to Reinet Investments’ latest annual results, the Luxembourg-listed investment company chaired by Rupert holds 230,000 shares in SPDR Gold Shares, the world’s largest physically backed gold ETF.