YOU SAID:

I cannot decide which gem to put in my girlfriends engagement ring

INTO JAPANESE

私は私のガールフレンドの婚約指輪に入れる宝石を決めることができません

BACK INTO ENGLISH

I can't decide which jewel to put in my girlfriend's engagement ring

INTO JAPANESE

私はガールフレンドの婚約指輪にどの宝石を入れるか決められない

BACK INTO ENGLISH

I can't decide which jewels to put in my girlfriend's engagement ring.

INTO JAPANESE

私はガールフレンドの婚約指輪にどの宝石を入れるか決めることができません。

BACK INTO ENGLISH

I can't decide which jewels to put in my girlfriend's engagement ring.