The sale follows that of "The Oppenheimer Blue" diamond by Christie's in May 2016. That rectangular-cut, fancy vivid blue diamond weighing 14.62 carats, raked in a stratospheric $57.5 million and broke the existing record for the most expensive jewel ever sold at auction.
Louise Rowlingson, high jewellery specialist at Lorraine Schwartz's European flagship within Harrods, told CNBC that traditional diamond pricing doesn't apply to these hued gemstones.
"Coloured diamonds are exceptionally rare and valuable with red gemstones being the most difficult to find on the planet," Rowlingson said.
"Just like a high profile work by Picasso, market value for some of the most precious stones can be hard to estimate before it is revealed at auction."
But Rahul Kadakia, International Head of the Jewels Department at Christie's said that different customers were attracted by different stones.
"While we do see strong interest from Asian buyers in the field of coloured diamonds, the demand for colourless diamonds remains, with high prices achieved for the very best examples," Kadakia said.
The second-highest price achieved at the auction was for a pair of flawless diamond earrings, each weighing over 50 carats and together known as the Miroir de l'Amour (the Mirror of Love). Although the 17.6 million francs price coughed up by an anonymous buyer set the world auction record for a pair of earrings, it fell significantly short of the 20 million–30 million franc estimate.