I don’t think we have your expertise as we are mainly a manufacturer and we source the material from a knife factory that makes Damascus knife. We will try to ask these question to the knife factory but I’m not sure if we can have the answer.
The rod itself already has patterns on there so it’s unlikely they lasered the whole rod?
Here is the full story of our first Damascus yoyo in the yoyo community. Maybe this will give you more information. It says we tried laser engraving but did not work out.