Collectibles question

[Llust]

the answer to this is probably obvious, but i just want to make sure

i get that after a certain amount of time prior to a certain collectible gets sold out in the shop, the marketing price for it increases dramatically. as for birthstones, do the same collectibles for every month stay the same or do they change?
(i.e. if theres a may birthstone in 2015, there will be another one in 2016 or as i already explained if they change every year)

its just so i can know if collectibles have their limits for when they can be sold for high prices

 

[WonderK]

Birthstones are the same for every month. I believe the staff said they will be doing another year of them as well. This may change in the future.