The eye of the beholder.

As something of an authority on Gryphons (really am, actually - go figure), this Item Card seemed promising:


Except that it was referring to these hideous things:


Rare, I'll belive - because whenever they were made, they were ugly, and people knew it. These survived because they lived in a box in someone's attic, and a descendant thereof decided to sell them rather than continue the family tradition of hiding them away. Calling them "lovely" does not make them so.

(Actually, I don't know if "hidden away in the attic" is the case. But if any of my ancestors owned these things, I'd be trying to sell them, griffins or no. They're UGLY.)