On 18 April 2012 Sotheby's auctioned a large carved emerald brooch within a border of emeralds and sapphires.
http://www.sothebys.com/en/auctions/ecatalogue/2012/magnificent-jewels-n08843/lot.428.html
The brooch was then donated to the MET Museum by HH Sheikha Amna bint Mohammed Al Thani.
https://www.metmuseum.org/art/online-features/metcollects/brooch-with-carved-emeralds-and-sapphires
On 7 December 2016 Christie's auctioned another large carved emerald brooch made by Cartier. It came from the Blair family collection, having been purchased from Cartier New York in 1946.
https://www.christies.com/LotFinder/lot_details.aspx?intObjectID=6049421
I would love to see photos of it being worn.
What other large carved gemstones have been used as jewels?
1347