My concern would be more about the quality of the Damascus versus if it is fake Damascus.
If you combine 2 crappy steels, fold it a hundred times and grind a beautiful blade it is still a crappy knife ,,,,, that looks cool.
Pakistan, China and several other offshore makers have discovered how to manufacture beautiful pattern welded blades that just will not hold an edge, so beware. As with all cheap imports you get what you pay for.
I have several telltale things I look at to identify a dressed up cheap knife but if all else fails a light file swipe will tell you everything you need to know. It should slide off and feel like a file on glass. If it cuts easy, drop it and run. Too soft to be a real knife.
If a Damascus Knife is $25 to $150 it is most likely low quality. Craftsman made Damascus is expensive. A quality blank piece of nicely patterned Damascus steel can run hundreds.