{{short description|Yellow diamond}} {{Infobox diamond | image = De Allnatt diamant.jpg | size = | caption = Drawing of the Allnatt Diamond | name = The Allnatt | carats = 101.29 | grams = 20.258 | color = Fancy Vivid Yellow | cut = Cushion | mine = probably Premier Diamond Mine | country = probably South Africa | cutter = several | found = unknown (pre-1950s) | original_owner = Alfred Ernest Allnatt | owner = SIBA Corp. | value = at least USD 3 million }}
The '''Allnatt Diamond''' is a diamond measuring 101.29 carats (20.258 g) with a cushion cut, rated in color as Fancy Vivid Yellow by the Gemological Institute of America.
==Naming== This diamond was named after one of its holders, Major Alfred Ernest Allnatt, a soldier, sportsman, art patron and benefactor.
==Overview== The Allnatt's origins are unknown prior to Major Allnatt's purchasing of the diamond in the early 1950s. After purchasing the diamond, he commissioned Cartier to make a setting for it. The final setting was a platinum flower with five petals, a stem and two leaves, all set with diamonds.
The Allnatt was resold at auction in May 1996 by Christie's in Geneva for $3,043,496 US. At the time of its sale the Allnatt was {{convert|102.07|carat|g}}. and was graded Fancy Intense Yellow.<ref>{{Cite web |last=Amit Jhalani |title=Diamond Color Guide: Carat Weight Impact on Color Visibility |url=https://www.truesanity.com/blogs/diamonds/diamond-color-guide-d-vs-e-vs-f-vs-g-vs-h-2026 |access-date=2026-04-29 |language=en}}</ref> After being sold to the SIBA Corporation, the diamond was re-cut to its current weight and the intensity was upgraded as a result.
==Display== The Allnatt was displayed as part of the Smithsonian's "The Splendor of Diamonds" exhibit, alongside The De Beers Millennium Star and the Heart of Eternity Diamond.
==See also== * Eureka Diamond * List of diamonds
==References== {{reflist}} * Smithsonian Museum of Natural History. [https://web.archive.org/web/20050427005634/http://www.mnh.si.edu/exhibits/si-gems/allnatt.html "The Splendor of Diamonds"]. Retrieved April 13, 2005.
Category:Yellow diamonds Category:Diamonds originating in South Africa Category:Individual diamonds