The diamond Oppenheimer Blue
This blue diamond, certified by the laboratory of the GIA "fancy vivid blue", is cut in size emerald. It weighs 14.62ct. It exploded the record of jewels the dearest never sold during the auctions of Christie, in Geneva in 2016. It was sold to 57 541 779 US. It was named in honor of his previous owner: Sir Philip Oppenheimer.
It is considered one of the rarest in the World