Set with a radiant-cut fancy vivid yellowish green diamond weighing 2.52 carats, between similarly cut diamond shoulders, size 53, maker's mark. 

Accompanied by GIA report no. 5182886039, stating that the diamond is Fancy Vivid Yellowish Green, Natural Colour. 

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 15 May 2018, 10:30 AM