How can I tell if the 'oud' is synthetic or real?

I am aware that most oud notes in western ethanol based perfumes are going to be synthetic, is there any way I can tell if it's real or not in desi attars?

Context being I've recently been testing out Raahi Perfume's Oud attars and am wondering if they're legit or synthetic.

(I know the price point is often the giveaway but I'm not sure if that varies with concentration and stuff)