This version of the Birthstone Necklace is one of our best sellers. The oxidized version is made with 14k golf filled wire and oxidized sterling silver (black) chain. The real gemstones are wire wrapped by hand for the perfect delicate timeless design. This is the kind of necklace you can put on and leave on. The Y necklace on the model is Aquamarine (March) and approx. 16" so please leave us a note if you have any special requests or would prefer a custom chain length when you're checking out or we will make it 18", our most popular length.