Well it's his loss. I'll be taking my business elsewhere from now on.
Good for you! For a leather person to not know saffiano is leather, I'd be wary of them even handling my leather bags! They should know different leathers, treatments, whether it's full grain, pressed or whatever.
A jeweler "couldn't tell" if my gems were sapphires or not. I dunno, it almost seems illogical not being able to tell different gems apart especially the basic ones. I decided not to sell any of my jewelry to him.