For taking photos of pearls I'd personally use HDR method. This will give you all details you need. Take 5 photos with EV -2, -1, 0, 1, +1, +2, then merge them into one image using Photomatix, then use Detail Enhancment in Photomatix and then if needed use Raw Camera in Photoshop CS.
You will get a professional picture.
For more info and some galleries visit:
http://www.hdrsoft.com/index.html
And if you need to do some repeat work on your pictures using Photoshop like adding a water mark, resizing, changing size of canvass, you can always use actions recording or Automate option from Menu/File.
BTW There are a lot of good photoshop tutorials on youtube. Just have a look at them, exercise and you'll be flying after one month.
regards,
Simon