Gang Shou's brothers and men died with jewels.

Gang Shou made a bet with Naruto.

He said that if Naruto learned spiral pills within a week, he would give him the necklace.

As a result, Naruto used a powerful spiral pill in the battle with Dou the next day.

Anyway, it is the first generation of Huoying, even if it is unlucky, it is also a symbol. Gang Shou gave Naruto an expectation. Naruto looks like Gang Shou's younger brother.

As for the function, the necklace later seems to have the function of suppressing Kyubi no Youko's power, but it should only be a kind of hope that he can realize his dream of becoming Huo Ying. I thought the same thing.