YOU SAID:
I have this necklace which I've never warn
INTO JAPANESE
私は今まで警告したことのないこのネックレスを持っています
BACK INTO ENGLISH
I have this necklace I have never warned
INTO JAPANESE
私は今まで警告したことのないこのネックレスを持っています
BACK INTO ENGLISH
I have this necklace I have never warned
That didn't even make that much sense in English.