Africa-focused Gem Diamonds has sold a 13.33 carat pink diamond recovered at its flagship Letšeng mine in Lesotho last month for $8.8 million.

The high quality pink colour type I diamond sold at a tender in Antwerp, Belgium, achieving a record price per carat of almost $657,000.

The Letšeng mine is well known for yielding some extraordinary diamonds, At an average elevation of 3,100 metres above sea level, Letšeng is also one of the world’s highest diamond mines.

According to market analysts, the average price for pink, yellow, blue and green stones has risen consistently by 12% a year over the last few decades, driven by consumer demand for exotic and unusual diamonds.

This means they are less affected by other factors driving general diamonds’ supply and demand.