This is the Famous Dresden Green Diamond. It gets its name from the Capitol of Saxony where its been on display for over 200 years. The Gemmological Institute of America examined the stone in 1988. The quality diamond was found to be a rare type 11a and the clarity grade determined by the GIA was VS1 (first grading is flawless, then VVS1 and VVS2) and could be internally flawless, that is, extremely, extremely slight inclusions.
The symmetry of the cut and polish is very good for a diamond cut prior to 1741.
It's an almond shaped stone of apple green colour with a weight of 40.70 carats and set in an elaborate shoulder knot. It has a natural green body colour, not a green skin or scattered green patches.
It's believed to be of Indian origin and was purchased by Frederick Augustus 11 of Saxony at the Leipzig Fair in 1743.
Noice but for really noice, check out the pear shaped Millennium Star below which took three years to be cut with lasers.
This is the world's only internally and externally flawless 203-carat pear shaped diamond. It belongs to the De Beers Millennium diamond collection which includes eleven equally rare blue diamonds totalling 118 carats. Now that's flashy.