Naturally Colored Diamond Blog

Jaw Dropping Blue Diamonds

Posted by Tony Cathaway on 11/23/16 8:00 AM

Blue diamonds are an alluring option for those seeking beauty and a value-holding investment. In fact, colored diamonds have shown significant appreciation over the last 20 years. Both jewelry collectors and investors alike have flocked to these colorful diamonds and when they come to auction, the price tag often sets records. Here are a few blue diamonds that have hauled in hefty price tags over the last few decades.


In 2015, the 12.03-carat ‘Blue Moon’ diamond was sold for over $48 million at auction. At $4 million per carat, the Blue Moon diamond is one of the most expensive diamond per carat ever sold. The diamond was discovered in 2014 at the Premier mine in South Africa and demonstrates the highest possible color grading for blue diamonds. This means that it is free of any inclusions or scratches. The Gemological Institute of America (GIA) has even labeled the Blue Moon Diamond as internally flawless, a perfect clarity grade.

Another diamond that was recently determined to be from the Premier mine in South Africa is the Blue Heart Diamond. The origin was a mystery until a group of scientists from the Natural History Museum of the Smithsonian Institution concluded the diamond was a descendant of South Africa.  In 1910, Mrs. Unzue purchased the Blue Heart diamond from Cartier just two years after it was discovered in 1908. It is a 30.62-carat stone, and the largest heart-shaped diamond in the world. The GIA rates this diamond with a clarity grade of VS-2 (very slight inclusions), and it is arguably one of the prettiest diamonds in the world.

When the De Beers Millennium Star Diamond was initially found weighing 777 carats in Zaire, the massive rough diamond became the 6th largest in the world. Although the exact value of the diamond is not yet recorded, the diamond has been insured for approximately $145 Million. After over 3 years of cutting and polishing, the Millennium Star Diamond stands in its pear shaped form and weighs 203.04 carats. It is very rare to see an internally flawless diamond; the Millennium Star Diamond is the only stone rated both externally and internally flawless.

The Blue Hope Diamond might not be labeled as flawless, but it is one of the most stunning gems in the world. It is a 45.52-carat stone that was found in India. Folk tales say the diamond has been cursed for being stolen from the eye of a scared Hindu Goddess Sita. An assortment of owners through history have experienced tribulation while owning this gem. Surprisingly, this wouldn’t be the first time a diamond was infamous for being stolen from a religious statue. Today, the gem is part of the National Gem Collection and holds an estimated value of $250 million.

The Oppenheimer Blue Diamond was sold by Christie’s in Geneva in May of 2016. The 14.63 carat diamond has a VVS1 clarity rating, only one rating degree below internally flawless. The Oppenheimer Blue is a fancy vivid rectangular-cut diamond. It was sold for nearly $4 million per carat, with a final sales price of $57.5 million.  

The De Beers Millennium Jewel 4 was sold by Sotheby’s in Hong Kong in 2016. The 10.10 carat diamond was rated as internally flawless. The Millennium Jewel 4 is an oval shaped fancy vivid blue diamond. The diamond is part of a set of precious diamonds brought for sale by De Beers. The diamond sold for just over $3.1 million per carat, for a final sale price of $31.8 million.

The Winston Blue Diamond was sold by Christie’s Auction House in Geneva in May of 2014. The 13.22 carat diamond was rated as internally flawless. The Winston Blue is a pear shaped fancy vivid blue diamond that sold for $1.8 million per carat. The final sale price of this stunner was just under $24 million.

For more reading about colored diamonds, see the links below: 

Topics: Things to Know


Colored Diamond Insights

It's like your own knowledge repository!

The world of naturally colored investment diamonds and jewlery is fascinating! 

Auction prices hitting new heights, stars and entertainers wearing new fancy colored diamonds, and backstories on some of the most iconic colored diamonds of all time. 

You won't want to miss one of our insightful posts!  Sign up to receive a notice every time we add a new piece of content.

Subscribe to Email Updates