Well spotted Dave!
According to the V & A's entry for the 1831 painting of Frances Anne, Marchioness of Londonderry by Dubois-Drahonet, the large brooch in the centre near the hemline of the Marchioness' dress is the one on display. It is a pink topaz, and is the one we could see in Kasper's photo.
See V & A http://collections.vam.ac.uk/item/O1295680/portrait-of-frances-anne-vane-oil-painting-dubois-drahonet-alexandre/
The pink topaz was given to Frances Anne by Tsar Alexander.
The brooch with the yellow central gemstone in Kasper's photo was also a gift from the Tsar, and it too can be seen in the Dubois-Drahonet painting.
The V & A has this superb close up of the jewels on the front of the Marchioness' dress, which allows us to identify many of the jewels.
We can see elements of the turquoise suite as well as some of the amethysts.
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