Hundreds of items from the former home of Prince and Princess Michael of Kent were auctioned on Friday.
The pink fabric-covered wardrobe went for £1,050
Bargain hunters were disappointed at the sale in Cirencester as competition sent prices soaring.
Bidding for items with a royal connection started at just £2, but many items exceeded their estimated value as a result of bids from across the world.
A pink fabric-covered wardrobe which was expected to fetch no more than £20 went for £1,050 to a telephone bidder.
An acoustic guitar in a faux crocodile skin case, expected to reach £60, was sold for £320.
The prince and princess sold Nether Lypiatt Manor, their Cotswold mansion near Stroud, in April and decided to sell many of the items from the eight-bedroom house.
The sale took place at Moore, Allen and Innocent's nearby salesrooms.
Other items included an exercise bike and a step machine, although many of the couple's more exclusive items were being held back for specialist sales.
Principal auctioneer and valuer Philip Allwood said: "We have had people e-mailing bids from places including the USA, Cyprus, Scandinavia and Australia this morning."
TV antiques expert David Dickinson said he was "astounded" by the prices being fetched.