Thus the Blue Moon weighing 12.03 carats, sold for CHF 49M including premium by Sotheby's on 11 November 2015, is not just a fancy vivid blue, the most prestigious hue among the blue diamonds. Its total purity generates a phosphorescence after exposure to UV that had never been observed from a blue diamond of similar size.
The fancy vivid green is another extreme rarity caused by an exposure to radiation during the formation phase of the crystal. One of them weighing 2.52 carats was sold for CHF 3.1 million including premium by Sotheby's on November 17, 2009.
The fancy vivid green named Aurora Green is a wonder of nature. It is estimated HK $ 125M for sale by Christie's in Hong Kong on May 31, lot 2073.
Like the above referred diamond sold in 2009, the Aurora Green has a perfect green with no other color shade. It is the largest fancy vivid green known to the GIA with a weight of 5.03 carats after cut. The GIA notes that it has no fluorescence. This feature is perhaps unique for a diamond of this highly rare color.
The Aurora Green is rectangular with cut corners. Its clarity is VS2. It is mounted on a ring in a circle of small pink diamonds.
SOLD for HK$ 130M including premium