Clean up badly photographed jewellery photos

I have about approximately 1000 jewellery photos that have been taken with poor light and various other imperfections. I would like these cleaned up so that the background is white and the jewellery in the focus on the photo is cleaned up without any jagged edges or cuts into the subject matter. The final result is expected to be a 1600 x 1200 jpeg file per original file that has the jewellery centered in the middle and cleaned up. The successful bidder should have access to dropbox as that is how the files will be shared and based on the original file quantity and size, there should be sufficient space in that dropbox account for the whole project directory to be shared with you in one go. I have attached some samples of the original photos to give you an idea of what type of work is required for this job. I would prefer someone who has done this type of work before, specifically with jewellery and I would expect to see examples of before and after work that you have completed to show me the quality of your work. These images will be used on a website and possibly in printed brochures so they must be of high quality with no noticeable imperfections. If the image cannot be completed to that standard then I would prefer it is skipped and the next possible image is worked on. Thanks, Ross