The Christie's Geneva auction sold the 76.02 carats, D / IF Cushion cut Archduke Joseph Diamond sourced from the Golconda mines in India, for a value of $21,474,525, which it noted is a world record for a Golconda diamond and a world record price per carat for a colourless diamond, reports say.

The diamond is characterized as colourless, internally flawless, reports suggest.

The auction sold 19 lots over $1 million each, reports say.