
- Chloe Diamond
On November 2007 Sotheby’s auction house George Marciano owner of Guess Jeans is the winning bidder of the 84.37 carats colorless diamond he later named “Chloe Diamond” after his daughter. The price that went under the hammer? US $16,189,769 million! It is the second most expensive D-Flawless diamond ever sold at the auction and the most expensive diamond per carat weight for US $191, 980 see video. It is dominated the by “Star Of The Season” weighing 100.10 carats pear shape D-Internally Flawless sold for US $16,548,750 making it the most expensive colorless diamond sold by piece and the second most expensive per carat weight for US $164, 835.00

- Star Of the Season Diamond
1 carat D-Flawless round diamonds have sold for as much as US $63,000 (March 1980)
When the GIA International Diamond Grading System was invented most polished diamonds sold on the market that time were transparent as the too hazy, too cloudy and too oily looking ones are reserved for industrial purpopses. Unfortunately diamonds that are not transparent or white lacking fire and brilliance are now sold as gems. So Beware!
Let me teach you what transparency is and its difference from clarity.

- frosted

- transparent
Assuming both wineglasses are flawless but only the latter is transparent while the former is frosty. A D-Flawless diamond might be considered a reject if it is not transparent. D being the highest possible grade for colorless diamonds and Flawless being the highest possible clarity grade but unfortunately the “Chloe Diamond” does not look as limpid, transparent and watery as the “Star Of The Season”.
Hazyness, cloudiness and oilyness is not a clarity feature but a transparency problem. Gemologists grade clarity using a 10 power magnifying lens or loupe and up to 100 power for a microscope. Microscopic impurities and crystal defects scattered throughout the stone that cannot be seen with a microscope does not make the diamond flawed but it will make the diamond look less brilliant, dispersive and transparent. And diamonds are supposed or needs to be transparent first before anything else for it to perform as a beautiful gem!
When institutions such as GIA or AGS starts to revised their diamond grading system and include transparency many perfect diamonds we know today will no longer get a perfect grade once regraded.
The “Chloe Diamond” might be a Type Ia diamond which accounts for 99% of all the diamonds in the world which are mostly yellowish, brownish and off-white colored incorrectly by impurities of nitrogen. The remaining 1% are shared by Type Ib which are mostly canary yellow diamonds colored correctly by nitrogen, Type IIa which are ideally colorless and highly transparent and clear or being red, green or pink and even brown due too crystal lattice deformation which can be corrected through HPHT treatment and Type IIb which are blue diamonds colored by impurities of boron.
Type IIa diamonds will cost two times or more than a Type Ia diamond of the same color and clarity. So imagine a Type IIa diamond the same size as the”Chloe Diamond”?
So when looking for a diamond think of wineglasses and look for a diamond that resembles the transparency and limpidity of the “Star Of The Season”. The most beautiful diamond should look like a clear mountain spring water, absolutely colorless or even beyond that and flawless to the max! A diamond possesing such virtues will exhibit a rare phenomenon in the diamond world called “blue afterglow” that is not fluorescence but a tyndell effect due to the diamonds perfect and pure crystallization and this can only be seen by direct sunlight.

- like a clear mountain spring water