system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] When Harry first gets his invisibility cloak Ron comments "Wow, these are pretty rare!", but then we are told that they not just "pretty rare", the cloak of invisibility is an unique item and (allegedly) one of the top 3 most powerful objects in the Wizard world, so...

1) Is there any other of it's kind?  


2) Is Ron faking any knowledge of the cloak?

&#x200B;

3) If he is not, how does he know about and why is he lying to Harry about what it is?
gpt
Cloaks of invisibility are rare. *The* Cloak of Invisibility is unique. (Most cloaks fade, the Cloak doesn't)

For perhaps a mundane equivalent, if you find a fancy golden cup, that's pretty rare. If you find the actual Holy Grail, that's a unique historical find.