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Gem's.
Gem's could also be 'gem is' so you have to note the context of the word to tell if it is possessive or 'is'
eg
The gem's green -- gem's = gem is
The gem's colour is green. -- gem's = possessive
You must have at least 1 gem and you can gem an ability at the start of the run, you can see the abilities you can gem at the left side of the screen.
1 island 6 island
Gem Allen is 5' 5 1/2".
october gem is a gifted gem from the undead