Can anyone recommend a fiber laser engraver for jewelry?

I’m not saying that you need this specific machine, but this video shows some cool things:

If you are located in the US, I have been happy with the machine I got from Fiber Lasers Machines – Lasers Only

I believe I have this one: 50W Fiber Laser Marking Machine JPT – Lasers Only (but based on the pics it looks like they made some upgrades to it since I purchased - it looks good)

The JPT source is good and “MOPA” is the part that will aid with doing colors on stainless, if that is your desire. Doing colors is finicky, btw, and your exact results will also vary based on things like ambient temp.