Experienced Photoshop retoucher to convert images of silver jewelry to yellow gold

We have a database of hundreds of images that are both white background images and grey background images. We need a highly experienced Adobe Photoshop retoucher to convert images from Sterling Silver color to Yellow Gold Color.
The images you present to us must be of equal or better quality and it is vital that only the metal (i.e. the Silver) is changed into yellow gold and not the gemstones or diamonds. The gold color must be realistic and not too pale and not too artificial.

These are to be used professionally on a jewelry website so please only send a proposal if you can complete this task to a very high standard.

This initial project is to find a person who is capable of completing the task to our accepted standard.

Experience in retouching jewelry photos is essential. Past work of similar tasks would be helpful to see.

This hourly is for 10 images only. If you provide a great service and quality work, we will use you again for larger batches.

Please convert the 2 images below into yellow gold and then save the images. Then remove the background so they sit on a pure white background. Do not change the colour of the stones. We want to see 4 images - 2 with pure white backgrounds and2 with the grey background as in the pictures. The photos are taken on a stand so if you can do your best to make the ring look like a professional image. so we can see what your skills are. Thank you.