585 is the european mark for 14k gold, which means that instead of your chain being silver it's actually 14k white gold. =)
What Does The 585 Mark On Silver Jewelry Mean?
585 is gold - white gold.
Since it was already answered I just wanna add my two cents. If you want to buy really qualitative jewelry, say, earrings, then it's better to visit proven, reliable internet shops. Remember, there's no such thing as a free lunch.