Turn on the machine and open xTool Creative Space on your computer. Drag the required xcs file into the program. Place the stainless steel necklace inside the machine. 

Refresh the page, click on 'Distance' to measure the distance, and make a material array to prepare for engraving. 

Set the material array to red light, change the density to 300, power range to 20-80, and speed range to 10-1000.

After the engraving is completed, adjust the settings based on the colored par, narrowing down the setting range.

Setting the new array settings.

Finish engraving, note down the settings of your favourite colour.

Set elements in the design that need to be engraved in the same color to the same layer. Then, unify all elements within the layer to the settings of the corresponding color. Begin the engraving process.

Done.