Photo credit for photograph of
The Allnatt - The GIA
The Allnatt diamond is a cushion cut fancy vivid yellow diamond weighing 101.29 carat.
Considering that 5 carats are an equivalent to 1 gr it means that this huge diamond weighs over 20 gr!
The rare color grading for a diamond of this size was done by the GIA.
The full report is even more impressive - 101.29 carat Fancy Vivid Yellow Diamond with VS2 clarity.
The high clarity grading is exceptionally rare when it comes to such oversized diamonds.
The Allnatt diamond was named after its first known and recorded owner - Alfred Ernest Allnatt, an English businessman and philanthropist.
Even though the source of the diamond is unknown, different experts tend to attribute it the De Beers Premier Mine in South Africa.
This is simply because the diamond carries some of the same characteristics of other diamonds from that area.
The Allnatt was bought by Alfred Ernest Allnatt in 1950 and was brought to Cartier for setting.
It was mounted into a beautiful pin made of platinum in the shape of a flower. The flower had five petals, a stem and two leafs where everything but the Allnatt Diamond was set with white diamonds (see image below).
The Allnatt was presented in the Smithsonian museum as a part of the famous sublime diamond exhibition splendour of diamonds, along side the Millennium Star, Heart of Eternity, Moussaieff Red and Steinmetz Pink.
The last time this diamond was sold was at a Christie's Auction back in May 1996 and it was bought by SIBA corporation for the amount of over $3,000,000.
The Allnatt diamond is here on the left while on the splendour of diamonds exhibition at the Smithsonian.