Change Silver Jewellery to gold

[denzjos]

My attempt:
- Copy the Original layer
- on the new layer:
- G'Mic-Qt / Artistic / Comic Book (all sliders on the left / enable "Add Colors")
- Remove black lines (select with the color tool and erase the selection)
- Erase the red ruby (use the 'Eraser Tool')
- Colours / Desaturate
- Use Curves to convert the dark areas to gray
- Colours / Colourise (use yellow - own taste)
- Set the layer to Multiply (adjust the transparency if necessary)