Diamonds by Passenger, from his album "Flight of the Crow" from 2010.
He plays it with the capo on 7th fret - at least on the version I listened to:
The album version on spotify featuring Simon R. Beckleman, which seems to fit this
version from Youtube exactly:

The other tab here is fine, but had the missing g/Gm as flaws, so I decided to work that out
and also add a short section of the guitar in the intro
The little guitar riff intro-thing he does will be included at the bottom, for those who fancy that.

For the rhythm I suggest you listen to the song and sort out what works for you :)
F C G g F C G
   Well I spoke to this Fman
C   Said he’d been to the mGoon
g  Carved his name in the gFround
   Saw the world spinning rCound
   (and) came back that afterGnoon.
   And I laughed at this Fman
C   Said he’d been lost at sGea
g  Heard the sirens' cFall
   Seen the pirates fCall
   To the monsters in the dGeep
   I said I’d heard some tall tFales
C   Some good stories in my tgime
g  So I asked him for prFoof
   And he showed me the trCuth
   There was dancing in his Geyes.
1st horn interlude: F C G g F C G
(you can play the guitar "riff" here, if you fancy)
   I could not believe thiFs man
C   Said he was a millionaire G 
g  He said: "I know I dress in rFags
   But I drive a vintage 'JCag'
   And I’ve got a diamond chandelGier".
   I said I think I need a drFink
C   And made my way outsidge 
g  You know I’d swear this was a spFoof
   If it wasn’t for the tCruth
   There was dancing in his Geyes.
2nd horn interlude/solo: F C G g F C *G X2
(There isn't rhythm as such in the last verse, just a strum per chord will do)

   When I came back in the rFoom
C   The man had disappGeared
g  He left a rock from the mFoon
   An eyepatch and a dCiamond
   From a chandelGier.



-------------------------------------------------------------------------------------------------------------
The guitar figure during intro, which also fits during the interludes.
It's up to you whether you play the stuff in ( ). It's nice as fillings if you play alone.

Relative to capo:

F C G g

e|-----------------------------------------------------|
B|--1--3--5--3--1--1-----(0)--0--1--3--5--1-----(1)----|
G|-----------------2-----(0)--------------0-----(2)----|
D|--2--3--5--3--2--3-----(0)--0--2--3--5--2-----(2)----|
A|---------------------------------------(3)----(0)----|
E|----------------(1)----(3)---------------------------|


F C G

e|---------------------1---0---------------------------|
B|--1--3--5--3--1--1-----------3-----0--1--3--5--1-----|
G|-----------------2---2---0--(0)---------------(0)----|
D|--2--3--5--3--2--3-----------0-----0--2--3--5--2-----|
A|----------------------------------------------(3)----|
E|----------------(1)---------(3)----------------------|


If you aren't playing with a capo, simply add 7 to the number of the frets listed above,
as such your 1st fret relative to capo would be your 8th fret instead, your open string in capo = 7th fret.
You get the idea :)

Hope you found this useful!
Enjoy, and feel free to leave a comment regarding any errors :)