Although it was largely overlooked by the public at the time of its release, the album's critical standing has improved over the years and today Just Another Diamond Day is now by many considered one of the best works in British folk.

Vashti Bunyan had initially appeared on the English music scene in 1965 after meeting record producer Andrew Loog Oldham with a promising assortment of original material.

Even with the hype boasting that Bunyan could replace Marianne Faithfull, who had recently departed Decca Records, her debut single, the Mick Jagger and Keith Richards-penned "Some Things Just Stick in Your Mind", did not achieve much critical traction.

Writer Keith Wallace has stated Boyd's abundant experience producing exotic musical acts and expert mixing abilities would prove invaluable as Bunyan came off a long hiatus from recording.

[4] Bunyan was joined by a wealth of musicians, including John James, Robert Kirby, Robin Williamson of the Incredible String Band, and Dave Swarbrick and Simon Nicol of Fairport Convention.

[10] Music historian Richie Unterberger has remarked that despite the influence of outside artists, the drum-less, acoustic arrangements on Just Another Diamond Day complemented Bunyan's measured and wispy vocals.

Richie Unterberger, writing for the Allmusic website, described the album as "a pleasing yet overly dainty slice of British rock-tinged folk" and goes on to say it was Bunyan's most serious-minded effort up to that point.

Young goes on to say that Just Another Diamond Day's themes "existed not in the traditional geographical locations of the British Rock scene...Instead it flowed from zones far more remote: the dual landscape/dreamscape of Britain's interior".

[19] Critic Dave Henderson, writing for Q magazine in 2000, remarks that "Bunyan's voice is lonely, lovelorn and fragile, and with three tracks scored by Nick Drake arranger Robert Kirby this remains an achingly memorable outing".