If a guy friend gave a friend who's a girl a heart shaped necklace for her birthday, does that mean something?

So, if a guy gave his friend who’s a girl a necklace for her birthday (both single atm) a heart shaped necklace, does it mean that the guy’s trying to hint something?

My sister’s birthday was yesterday, and one of her friends, who’ve i always suspected liked her, gave her a heart shaped necklace. Sometimes i can’t tell whether that’s just how his personality is, or if he likes her?