You should probably just put them in auctions. I know a lot of people can actually find them on the ground for free sometimes (that's how I got quite a few) because some people donate so often, lol.
Yeah, the first time I found one I was like "WHAT?!! IS THIS A MISTAKE?!!" Lol. But then I saw on the forums that some people donate until they hit the daily maximum the game will allow! They do it so they can learn skills faster. Then I was in Alpine Vista once and someone had dropped 3 others! Lol.
Kai~Sprinkle extremely hallowed powder over the shrine then donate some gems that you have mined ....or just donate them without the powder if you cant make it yet