The ‘Perfect Pink’

Pink diamond is a type of diamond that has pink color. The source of their pink color is greatly debated in the gemological world but it is most commonly attributed to enormous additional pressure that these diamonds undergo during their formation.

Christie's Hong Kong sale will be led by The Perfect Pink, an exceedingly rare 14.23 carat fancy intense pink diamond. Only 18 diamonds over 10 carats with a distinct pure pink color have appeared for sale in over 244 years of auction history, and none of them were graded a fancy intense pink at the time, putting this exceptional gem in a class all its own. It's expected to make between $14 and $19 million. It is the most valuable jewel in the Asian subcontinent, according to Vickie Sek, director of Christie's Asia's jewelry department.

Cost: 23 million USD