How do I place 2 borders around an image ?

[Clueless]

Hi 


Please can anyone tell me how do I place a white border around an image that has a white surrounding area, and then another coloured border ? 

I thought it would be as easy to insert a white border first and then another larger coloured (colored) border, however the white border has a differently shaded area along 2 sides with a mitre in one corner. 

thanks in advance