Can i lose one stone in a month???

I weigh 9 stone 4 (60kg) and want to weigh 8 stone (50kg) is this possible in one month?? I am starting a fruit only diet to achieve this, do you have any helpful suggestions?? thanks!
Update: i do cycle to and from work that's about 1 hour a day.. thanks for your help.
Update 2: ;-)) and the reason for this desire to lose the flab?/ i'm a diving instructor and have been working in an office for 5 months to save some money for a course. i'm going to be back in a bikini in a month and it's frightening!
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