Real rupees.

[Mysterious F.]

A rupees is the currency in India.

[Gamefreak]

Do they stash them in bushes and rocks?

[Dehumanizer]

i have paper money of rupees

[Mysterious F.]

I don't know what the rupees there are like at all, but I only know it is the name of the Indian currency.

[MasterKeyX]

thats cool. I wish i had a ruppes in my wallet . is it like a gem, or a piece of paper?

[Hi no Seijin]

The below is an example of few rupees from India.

The below is an example of a rupee from Hyrule.

[Harashi]

I think they used to use gems until they changed to paper.

[Hi no Seijin]

Perhaps.  I didn't look too far into it.

[Dehumanizer]

The below is an example of few rupees from India.

The below is an example of a rupee from Hyrule.

i have the 20 rupees

[Mysterious F.]

Well, it is highly possible that they were once real rupees instead of paper, since India used to be one big diamond and diamong-like crystal mine.

[Gamefreak]

Again I ask, do they stash them away in rocks and bushes?

[Mysterious F.]

The Minish claim they are leaving them for humans to find, but really they're just hiding it for themselves, yet in bad locations.

[Gamefreak]

Their skill of hiding rupees is on par with the "Easter Bunnie's" ability to hide eggs.  It's true.

[No iT iSNt]

it kills it since theyre not real gems

[Mysterious F.]

Well, they hide them in obvious places, even the dumb Moblins find them.