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most gems are rare because there are vary few of there kind. but some of gems kinds have plenty! (:
precious gems are rare and valuable and the semiprecious are not as rare
You have to get 3 Very Rare Gems or anything that is Very Rare. If you try, you will get it!
You can either use 3 rare gems or 2 rare gems and a semi-rare gem. I'm not exactly sure what are rare gems though but well that's it
Rubies are very very rare