Scheduled for the December 7 London Jewels auction, the radiant-cut, fancy-intense-yellow diamond, boasting a VS1 clarity, is elegantly set between shield-cut diamond shoulders, as announced by Bonhams on Tuesday.

In addition to this showstopper, two other remarkable yellow diamond pieces are set to go under the hammer. One is a brilliant-cut, 10.02-carat, fancy-yellow diamond single-stone ring, while the other is an 8.45-carat, step-cut, fancy-yellow diamond ring adorned with four pear-shaped diamonds and set between baguette and step-cut diamond shoulders. Both pieces carry estimated values ranging from GBP 50,000 to GBP 70,000 (approximately $62,300 to $87,200).

The auction, featuring a total of 149 lots, will showcase an array of items from various single-owner private collections spanning from 1870 to the modern day. Notable names such as Cartier, Bulgari, Graff, Moussaieff, Van Cleef & Arpels, Harry Winston, Boucheron, Tiffany & Co., David Webb, and Grima will be represented.

Among the highlights from a single-owner private European collection are a Lalique Art Nouveau enamel, pâte-de-verre, sapphire, and diamond pendant dating from around 1905 to 1915. Additionally, a Cartier Panthère coral, emerald, onyx, and diamond brooch from circa 1968, as well as a Cartier ruby and diamond clip and ear clip suite brooch combination from around 1960, will captivate bidders.

Another remarkable collection, originating from a descendant of Dorothy Maud, Countess Haig, includes a pearl and diamond tiara necklace presented to the countess by Queen Alexandra in 1905 on her marriage to General Haig.