A solar-powered calculator, tree seeds in a bottle and a collection of each British coin up to the value of £1 to mark the 20th anniversary of decimalisation were also included in the 1991 collection.
The items were chosen by children who suggested eight items representing life in the 1990s for a BBC Blue Peter competition.
The then Princess of Wales, who died in a Paris car crash in 1997, buried the container at Great Ormond Street Hospital (GOSH) in London in March 1991.
The capsule was dug up early as the construction of a new children’s cancer centre begins.
Staff at the hospital, either born in 1991 or already working at the hospital that year, helped to remove Diana’s capsule.
She became the president of GOSH in 1989 and regularly visited the specialist children’s hospital.
A few months after burying the capsule, Prince William, then eight years old, spent two nights at the hospital with his parents after suffering a fractured skull following a blow to the head from a golf club.
Minogue’s Rhythm of Love – released in November 1990 – was the singer’s third studio album, and included hits such as Better the Devil You Know and Step Back In Time.
