Charm: 9mm L x 5mm W Solid Sterling Silver 2.5mm Round Faceted Genuine Gemstone in Blue Zircon Matte Finished Silver December Birthstone Charm in Genuine Blue Zircon Blue Zircon is a beautiful, transparent turquoise color. Add this sparkling gemstone charm to any necklace or bracelet to represent the birth month of someone born in December. This solid sterling silver pendant features a flush set genuine blue zircon gemstone.This faceted blue zircon is the birthstone for December. Birthstone prices vary depending on the cost of the stone. The pictures in Alternate Images are there to show the scale of the product. Colors and other details may vary.