What cut does this Green Emerald (Panna) represent?

(Click image to zoom picture)
Maharani Jind Kaur's Green Stone (Emerald?) necklace

What cut does this Green Stone (Emerald?) necklace represent? Are there more Stones available in this shape? How did one cut these stones in the past?

And also do any one have any information on the whereabouts of these jewelries ?

It is heard that, the famous Ko-hi-noor diamond used to be worn by her.

She wrote the following to the British when she escaped in 1849 after shifting several prisons. "You put me in a cage and locked me up. For all your locks and your sentries, I got out by magic ... I had told you plainly not to push me too hard - but don't think I ran away, understand well that I escape by myself unaided ... When I quit the fort of Chunar, I threw down two papers on my gaddi and one I threw on a European charpoy, now don't imagine I got out like a thief!"

====Update Oct 6th 2009====
Finally today we could see this very necklace discussed. It was getting auctioned at

Bonhams
Next Indian and Islamic sale
October 8, 2009
New Bond Street, London, England.

http://www.bonhams.com/cgi-bin/public.sh/pubweb/publicSite.r?sContinent=EUR&screen=lotdetailsNoFlash&iSaleItemNo=4387717&iSaleNo=16851&iSaleSectionNo=1

==Update Monday 26 Oct 09==

I just checked the action the necklace was sold as the above url at bonhams say "Soldfor £55,200 inclusive of Buyer's Premium"

Wonder who brought that, if anyone has the info, please post details.