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Three generations came together at the Savoy in Dunedin on Saturday to celebrate their time at the girls' college.
Jenny Alloo (82), who attended the college from 1946 50, said there had been many changes over the years but Columba's core values remained intact.
''There are so many more buildings. We used to have just one science lab; now there is a whole block of them. The grounds are still lovely.
''I loved my days there. You always felt safe there and the teachers were wonderful. They were just very relaxed days. You had your exams and your school dances and then you would go to the boarders' houses in the holidays.''
Mrs Alloo made two replicas of the summer uniform she used to wear at the college and her granddaughters, Kaitlin Chamberlain and Annabelle Alloo - who attend the college - wore them with pride.
The uniform, called ''the rainbow dress'', was worn during World War 2 when material was scarce for school uniforms.
All the college's uniforms throughout the years were modelled at the centenary.
Mrs Alloo's daughter, Jenny Chamberlain (nee Alloo) remembers the friendships she made as the most important thing about the college.
''Everyone knew everyone and everyone felt like they belonged.
''There was and still is a great sense of school pride,'' she said.