retouching 4 jewellery pictures

I need 4 jewellery pictures retouched. The background color has to be white (not it is black). the jewelleries have to be painted - but in a professional way. the pictures have to be in 300 dpi resolution. one example how they should look is attached, the file is called example.jpg. the jewelleries in question are attached in low resolution. you will get the high resolution file when you get the job. please send an example. br alex