Posted on October 2, 2013 by

The Star of Sotheby’s Hong Kong auction on October 7: The 7.59 carat Fancy Vivid Blue IF Round Brilliant

Colored diamonds have an allure and mystique that are unique to them. But even among colored diamonds, a hierarchy of rarity and value exists. As part of their Magnificent Jewels and Jadeite auction on October 7, 2013, Sotheby’s Hong Kong will offer ‘The Premier Blue,’ a 7.59 carat Fancy Vivid Blue Internally Flawless round brilliant cut diamond, the largest of its kind to ever be graded by the GIA.


The Premier Blue

At 7.59 carats, this Natural Fancy Vivid Blue Internally Flawless round is a heavy hitter.


The Premier Blue is a perfect marriage of shape and color. Where colored diamonds are concerned, the round brilliant cut is an uncommon shape because the goal to yield a polished colored diamond of the greatest weight is paramount. In their rough state, colored diamonds are often irregularly shaped, impeding efforts to transform them into round brilliant cuts.  The round brilliant cut is also used to maximize brilliance, or white light.  This means that color is often “leaked” in round cuts, so many colored diamonds are fancy shapes to preserve their intensity.  The Premier Blue is an especially notable colored diamond because it is a round brilliant that has achieved the highest color intensity in one of the rarest and priciest fancy colors.


The confluence of three extraordinary qualities – the absolute best color grade of Vivid Blue with an Internally Flawless clarity at an oversize weight of 7.59 carats – makes The Premier Blue one of the most important and unprecedented colored diamonds of all time.


The Premier Blue

The GIA cites The Premier Blue as the largest Fancy Vivid Blue IF round brilliant they have ever graded.

The GIA has established The Premier Blue as a type IIb diamond. To put the rarity of this diamond into perspective, less than 2 percent of all gem diamonds qualify as type II. Type IIb diamonds are the absolute rarest in nature – the GIA estimates the natural blue diamonds they have encountered total less than half a percent. Blue (and gray) diamonds owe their color to low levels of boron in their chemical composition.


To learn even more about this rare diamond color, read our expert guide to fancy blue diamonds.

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