Gem's.
Here is more information regarding CHO THUÊ ĐẤT NỀN visit the internet site. 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
特に記載がない限り、内容はクリエイティブ・コモンズ 表示のライセンスで利用できます。