Precious jewellery is the most popular treasure asset type for wealthy individuals across all countries. Here, ADEDOYIN JOHNSON, gives eleven reasons why the super-rich is investing in pink diamonds: 

• Pink Diamonds Are Now Very Rare

• Certified natural Fancy Vivid pink diamonds are the most expensive diamonds.

• Pink diamonds have increased in value over the past decade.

• Their price ranges from $30,000 to $100,000 per carat, which is 20 times the price of a white diamond.

• The value of fancy light pink diamonds has increased by an average of 20pc year-on-year for the past five years.

• The Graff Pink, a rare 24.78 carats fancy intense pink diamond, was sold by Sotheby’s Geneva for £30m in November 2010.

• Setting a world auction record for any diamond or any jewel.

• The majority of all pink diamonds mined come from only the Argyle Mine located in Australia. 

• Argyle Pink Diamonds are so expensive because of the very limited supply.

• Pink diamond is formed of only carbon like a white diamond. This happens through millions of years in the kimberlite pipes of volcanoes. 

• There is only one coloured diamond for every ten-thousand colourless, says De Biers, the diamond specialist.