40 letters from Princess Diana up for auction 0:35
(CNN) -
This could be the most expensive piece of cake you'll ever taste.
They will auction a slice of Prince Charles and Princess Diana's 1981 wedding cake.
The portion, which weighs approximately 800 grams, comes from one of 23 cakes that were made for the royal wedding, according to Dominic Winter Auctioneers.
He wears a coat of arms colored in gold, red, blue and silver, a silver horseshoe and a leaf with dew.
It also has a decorative white frosting.
Lady Di statue unveiled in Kensington Garden 0:41
The piece of Diana's wedding cake was given to Moyra Smith, who worked at Clarence House for the Queen Mother, the auctioneer said, adding that it appeared to be from one of the cakes sent to staff.
The 40-year-old slice is preserved in plastic wrap in an old cake pan.
It was sold to Dominic Winter Auctioneers in 2008 on behalf of the Smith family.
The auctioneer said that "it appears to be in the same good condition as when it was originally sold, but we advise against eating it."
Other auction items
The list also includes the Wedding Ceremony and Order of Service print programs, which had an estimated worldwide television audience of more than 700 million people.
It also includes a commemorative Royal Wedding breakfast program.
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The auction will be on August 11.
Diana's piece of wedding cake is expected to sell for at least US $ 278, which is equivalent to £ 200.
This announcement comes just a few months after Princess Diana's children agreed to lend her wedding dress for public display at Kensington Palace.
A car that Prince Charles gave to Princess Diana as an engagement gift also recently went up for auction, selling for more than US $ 72,000 (£ 52,000).
Princess Diana Auction