The ceremony followed the singer's funeral at nearby Edgwarebury Cemetery and a memorial service at a synagogue in Edgware. Friends including Kelly Osbourne and Mark Ronson attended.
The Golders Green venue was chosen because the funeral of Winehouse's grandmother Cynthia also took place there.
A mourner said of the memorial service: "It was emotional, it was happy and it was sad. It was everything really."
One spectator told People: "It was very moving yet quite very humorous at times. It was a wonderful tribute to Amy."
Between 300 and 400 people travelled to Edgwarebury Cemetery in Edgware, North London for the 45-minute ceremony.
The inquest into Winehouse's death was opened yesterday and immediately adjourned until October 26. No cause of death was given following a post-mortem examination of her body.
Friends and family of Winehouse are now moving to the nearby Southgate Progressive Synagogue for a private gathering, BBC News reports.
The funeral service included a eulogy from Amy's father Mitch and ended with a rendition of Carole King's 'So Far Away'.
Stars Bryan Adams, Nick Grimshaw and Remi Nicole also attended the ceremonies.
> Amy Winehouse 1983-2011: Obituary
> Amy Winehouse 1983-2011: A life in pictures
> Amy Winehouse joins '27 Club': Icons who died young
Watch the Amy Winehouse 'Back To Black' music video below: