Box office According to
Kinematograph Weekly, the film performed "better than average" at the British box office in 1959.
Variety claimed the film earned just under $700,000 in Britain in 1959. Reportedly, it had made a profit of over £100,000 by 1961.
Critical reception Variety called it "a well knit pic... Although it hasn't anything very sensational in the way of stellar lure for houses outside of England, it is a holding yarn, acted persuasively. But, though obviously inspired by outbreak of color-bar and Nottingham, it ducks the issue, refusing to face boldly up to the problem. Thus the pic does not get its message over as effectively as it might. There is constant haggling over the problem and some snide remarks, but it eventually adds up merely to another whodunit." Josh Billings of
Kinematograph Weekly wrote "I'm always a nervous of films dealing with racial discrimination, but by legitimately introducing skilfully contrived "whodunit” into this provocative subject the director and script writer of “Sapphire” have succeeded in manufacturing a purposeful and exciting thriller. The film, which had a marvellous press, has attracted all classes." At the time of the film's original UK release,
Nina Hibbin of the
Daily Worker commented: "You can't fight the colour bar merely by telling people it exists. You have to attack it, with passion and conviction. Commit yourself up to the hilt. Otherwise you're in danger of fanning the flames." In the US,
A.H. Weiler of
The New York Times wrote that, while the film is "not entirely in a class by itself, the combination of murder mystery and racial issues puts it several interesting cuts above standard movie melodrama".
Variety called the film a "Sound murder drama which compromises uneasily on question of color discrimination. Though obviously inspired by
last year's outbreak of color-bar riots in London and Nottingham, it ducks the issue, refusing to face boldly up to the problem. Thus the pic does not get its message over as effectively as it might. There is constant haggling over the problem and some snide remarks, but it eventually adds up merely to another whodunit." The reviewer for the
British Film Institute's
Screenonline website wrote: "Dearden is not immune to prevailing prejudices, equating a young woman living alone in London with promiscuity, and seeing an enthusiasm for jazz as evidence of dubious character. The film is littered with casual, unchallenged racism".
Accolades At the
13th British Academy Film Awards,
Sapphire won the award for
Best British Film. For her work on the film, the
Mystery Writers of America awarded screenwriter
Janet Green the
Edgar Award for Best Foreign Film. ==Paperback novelisation==