The statue shows Diana wearing a sleek open-necked blouse, a wide belt and a pencil skirt.
Her hands are gently placed on the shoulders of two of the children - a boy and a girl, with the girl holding the princess's hand.
Sculpted by renowned artist Ian Rank-Broadley, the monument is 1.25x life size and was cast by Castle Fine Arts Foundry in the traditional 'lost-wax' process, with a patina of a bluish green over black.
The cast is hollow and is supported by a stainless-steel armature.
Beneath the statue is a plinth engraved with the princess' name and the date of the unveiling.
In front of the statue is a paving stone engraved with an extract inspired by The Measure of A Man poem.
It reads: 'These are the units to measure the worth,
'Of this woman as a woman regardless of birth.
'Not what was her station?
'But had she a heart?
'How did she play her God-given part?'
The delayed statue, which was due to be unveiled before the end of 2017, is situated in the Sunken Garden of Kensington Palace, which was one of Diana's favourite places.
