Security at Auckland's International Arts Centre has been beefed up for a major auction of art owned by Dame Kiri Te Kanawa next week.
Dame Kiri's collection includes three prized paintings by the artist Charles Goldie, as well as several works by top Australian artists.
On auction will be an oil painting by Goldie of the chief Wharekauri Tahuna, estimated to sell between $700,000 and $1 million.
In 2016 another painting of the chief sold for $1.377m.
The other Goldies in the collection to be sold include a 1940 oil painting of Tamati Pehiri, and an oil painting of Te Hei, a chieftainess of the Ngāti Raukawa tribe.
These paintings are expected to sell between $700,000 and $1.2m.
The centre's director, Richard Thomson, said hundreds of people had already viewed the paintings which opened to the public this morning.
"I think a lot of people realise it will be the last opportunity to see these paintings before they're sold and go into private hands. So we're anticipating fairly large numbers through the viewing, and of course everyone's welcome to come and view these."
Mr Thomson said Dame Kiri had owned the artworks for nearly three decades and now wanted the next generation to enjoy them.
Goldie was one of the finest artists New Zealand had produced and his Māori portraits were without precedent, he said.
In 2010, Dame Kiri sold another Goldie painting, Forty Winks, for $573,000 to a buyer through an auction at the centre.
At the time it was the highest price paid for a painting at an auction in New Zealand.
The collection is under tight security, with the show taking place almost one year after two Gottfried Lindauer paintings were stolen from the gallery.
The artworks will go under the hammer on 10 April.