Natural blue chalcedony necklace highly translucent untreated agate/onyx, paraiba color chalcedony white gold filled sterling silver jewelry. Thank you for taking a look at my product.Center stone dimensions: 0.7 x 0.5 in. Necklace length: 11.2 in. Come visit our page to see the rest of our amazing collectibles here. This item is made of quartz.