Christie's made auction history this past Wednesday evening in New York when The Bvlgari Blue Diamond, the largest triangular-shaped Fancy Vivid blue diamond ever to appear at auction, sold for $15.7 million. The auction results made this diamond the top jewel sold at auction thus far in 2010.

The stunning stone, which is mounted as a two-stone diamond ring, was designed in the 1970s by the legendary house of Bvlgari in Rome, and it was the star lot of Christie’s major Jewels: The New York Sale on October 20.

Photo credit Christie's Auction House.

The diamond has an sentimental history. It was offered for sale by a private European collector who has kept the ring in his family for almost 40 years. The gentleman had originally purchased the ring at Bvlgari's flagship boutique on Via dei Condotti in Rome in 1972, as a gift for his wife in celebration of the birth of their first child, a baby boy - thus the blue color.

The final sale price in 1972 was about $1 million US. Quite an appreciation in price over the 40 years!