Hi Oz Chick,
Not sure if this is an overkill for one stain but this is a good company that deals in removal of stains on marble.
http://www.gmcspecialist.com.sg/service.html
BTW I have found fruit to be the worse problem for marble, I think due to the acid content and also with marble being so porous. I make fresh fruit juice often and I can that say that I am very careful with the fruit because I have stains that I haven't been able to get out before.
Good Luck.
Rachel.