Jewelry product photo retouch with Photoshop.

we have about 100 items and add new items all the time, so this is a small batch that we hope to use to find someone we can work with long-term as the need arises. the stones in the pictures are the color/lighting/focus we want; but the background and color of the gold is uneven. we would like these pictures retouched: 1) we want a uniform background for all product photos, so the first deliverable would be to put all jewelry on the background "[login to view URL]" in a layered psd file. I did a quick example (I just used the lasso and am not very good a photoshop!). composite_example.psd. 2) the gold is a little off in some of the photos - the second deliverable would be to adjust the gold so the color would match the gold in the [login to view URL] item photo. the photos that need adjustment for the gold are: african opal_v2_lr, amazonite lr, garnet_lr, pink_adventurine. the others are okay - the white jade is rose gold so it doesn't match. 3) Since I can only attach 5 files, I'll add the bar and the composite_example, the [login to view URL] as the "benchmark gold" color and the african opal as an example of the gold that needs to be fixed. ***India, Bangladesh and Pakistan writers will not be accepted.***