These terms are always used interchangeably, there are differences between these three terms. The difference between these engraving concepts is the depth of the impact on the material.
Laser marking of jewelry is done with a low powered beam by discoloring the material to create a high contrast without disrupting the material surface.
The maximum engraving depth on jewelry is 0.02 to 0.125
The depth in etching is no more than 0.001.