The general answer is no; we do not engrave customer-supplied products like jewelry, knives, etc.  We can do laser engraving on some wood products; they must be flat; hardwoods engrave the best.  There are size restrictions, and the customer must supply one item at a potential loss for us to set up with.  We do our best not to ruin the test product, but it can happen.   Please contact us directly with your request, and we would be happy to answer any questions you might have.