The people upstairs are right. Your question is too general. I didn't want to answer at first, but I was as confused as you when I first learned PS. Let's simply talk about my own ideas. It doesn't matter whether you adopt or not. It would be my pleasure if I could help you.

Since it is a jewelry picture and the main body is jewelry, the purpose of decoration is to highlight the main body of jewelry.

The general steps are as follows:

1. image-mode-laboratory, and convert the image into laboratory mode.

2. Add a "curve" adjustment layer, and steep the curve in the area where the subject is located in the "lightness" channel (L channel) of LAB to increase the contrast.

3. Fine-tune the timbre of channel A and channel B to make it more vivid.

4. After color matching, stamp the layer to copy the layer, and select the L channel in the copied layer to sharpen it.

5. Turn the picture back to RGB mode and set the previously sharpened copy layer mode to "Darken".

6. Poke the layer again, save it in JPG format, and then save the PSD manuscript for later call or modification.

These are the general steps. If you don't understand, prove that you need to catch up with the basic skills of PS, and you have to ask for more happiness.