Pre-Auction Impressions: November 11th 2015, Sotheby’s Geneva

By The FCRF Team | 10.11.15
Pre-Auction Impressions: November 11th 2015, Sotheby’s Geneva

November 11th 2015, Sotheby’s Geneva

On November 11th, Sotheby’s will feature ‘The Blue Moon’, a 12.03 ct, cushion cut, Fancy Vivid Blue, IF diamond. Only once every three or four years do we see an important blue stone of this caliber at auction. The high estimate is $4.5 million per carat.

The stone is owned by a few international diamond companies based in New York, Israel and India. A small percentage is owned by Petra, proprietors of the famous Cullinan mine that unearthed this blue rough among other famous blue diamonds in the last century.

This diamond has a magnificent blue color at the darker end of the Vivid scale. The bottom pavilion has four large facets with very small “berlandere” facets for decoration, leaving the cutlet area with subtle glimmer. The stone was planned and polished in New York.

According to the Fancy Color Diamond Index, Vivid Blue diamonds showed price increases of up to 6% in the last quarter. Price increases for blue diamonds may be partly due to the ripple effect of the ‘Blue Moon’ sale, even though the stone has yet to be sold. Many blue diamond owners are anxious to see the results of this auction as it may determine the value of their blue diamond inventory.

The auction will also feature an 8.24 ct, pear-shaped, Fancy Vivid Purple-Pink, SI1 diamond.

IMG_4014 (1)


Although there is a striking difference between the catalogue and the stone in real life, this nicely shaped diamond exhibits an extraordinary sweet bubblegum color with a strong purple presence. In most cases, an SI1 grade will not dramatically affect the price of such a rare stone, but this particular diamond has inclusions that become visible to the naked eye when taking a closer look. The new buyer should focus on other attributes of the stone, not its clarity.

Most sellers emphasize the fact that the stone is a Type IIa, a detail that always seems to impress many diamond industry professionals, auction houses and collectors. The Type IIa classification in white diamonds is considered a real virtue because it indicates the stone has no nitrogen in its molecule composition, allowing it to exhibit a superior D color. It also corresponds with historical stones unearthed from the Golconda mine in India, which adds a lot of romance to the story of the stone.

Type IIa is not a virtue in pink diamonds. There is a tendency for Type IIa pink stones to decrease their intensity once they are exposed to UV light, as halogen or blue fluorescent light slightly washes out the color.

The high estimate of the stone is $2,020,466 price per carat.

Price Realized: $1,682,834 pc


The article has been sent to your email address. Enjoy!

People who read this article, also read:
FCRF Insights
Pre-Auction Analysis: April 27, 2022, Sotheby’s Hong Kong, The De Beers Cullinan Blue
As most of the industry has been prevented from traveling to Hong Kong during this challenging period, this auction analysis can help those who would like to bid without physically inspecting the goods. For your convenience, we have added a direct link to the GIA report. Lot: 1800 Description: 15.10 ct, Fancy Vivid Blue, Emerald, […]
FCRF Insights
Investment banks serving as a link in the diamond trade-chain between a diamond wholesale source and private clients is not a new practice. However, connecting a mining company directly to private clients has never been done before. Alrosa recently forged a groundbreaking partnership with an investment bank ###truncate### to develop a new platform to benefit […]
FCRF Insights
8 Things Your Client Needs to Know Before Buying a Fancy Color Diamond
Don’t Do 1. Don’t put too much emphasis on Polish, Symmetry and Clarity. These parameters were made first and foremost for colorless diamonds. The value of a fancy color diamond is determined above all by its beauty, quality of color and rarity. Color retention is a top priority when polishing a Fancy Color Diamond while […]
x close

To continue reading this article


Shopping Cart

You cart is empty

Discover The FCRF Tools and Services

Become a part of our community and get unlimited access to all of our innovative Tools and Articles

The FCRF App is now available for
Download Button
Continue To Website