Christie’s is getting ready to present The Golconda Blue, the largest Fancy Vivid Blue Diamond ever to be offered at auction.

The names of the great jewels in the collection — the Napoleon Diamond Necklace ... deep blue. It's in a setting designed by Pierre Cartier — surrounded by 16 alternating pear-shaped and ...

The 10-carat Mediterranean Blue, which will go on sale in Geneva next month, is the showpiece of a collection estimated at ...