In 1965, Canadian gemologists and experts from the University of Ontario concluded that the Darya-e-Nur and the Nur-ul-Ain diamonds are two parts of the Great Table Diamond
That is when The Great Table Diamond, which was mined from the Kollour mines on the Krishnaveni - a magnificent pink stone, which weighed about 350-450 carats, which Jean-Baptiste Tavernier(1605-1689) , a French gem merchant,had described in his chronicles - was taken away by Nader Shah to Persia.
It is said that the Great Table Diamond was studded in that magnificent throne along with several other unique gems.
The alluring Great Table Diamond was captured by his grandson Shahrukh after Nader was murdered in 1747.
In 1797, almost a year after acquiring the Great Table Diamond, Agha Qajar was murdered.
Fateh Qajar also commissioned an elaborate new crown, the Taj-e-Kiani for himself; the Great Table Diamond was not used to embellish any of the above.
We are not sure when the Great Table Diamond was divided into two.
The other part of the Great Table Diamond is the Nur-ul-Ain diamond.
It consists of two gold mounted diamonds, a smaller one above and a huge square table diamond in a rose setting below.
This must be a different occasion from the presentation of the single table diamond earlier in July and it is not impossible that Munoz has conflated the two occasions.
As she identifies the table diamond only by the fact that the Marquis de las Navas brought it to her from Philip, it must be the one which we know for certain he brought early in July before the wedding.
Patricia Muller, who had access to the Spanish records, has identified the jewel worn by Margaret in this portrait as the 'joyel de los Austrias', made up of a huge table diamond known as the Estanque and La Peregrina.