L'Incomparable Diamond

http://www.thejewelleryeditor.com/shop/product/incomparable-diamond-necklace/

https://diamondsinthelibrary.com/mouawads-lincomparable-diamond-necklace/

https://www.jewellerynet.com/en/news/4907

http://famousdiamonds.tripod.com/incomparablediamond.html