Gorgeous 14 kt 585 stamped gemstone neclace

Gorgeous 14 carat stamped 585 very delicate chain with a gemstone necklace beautiful preowned stamped 585 as opposed to 14 karat which is 14 karat gold. The stamp is on the movable claw of the necklace closure. Chain is approximately 16 inches. This is a beautiful very delicate necklace. I don’t know what the stone is. It’s very pretty. It’s a light blue.