The Sterling Silver Birthstone Wheel & Chain makes a thoughtful keepsake gift for a mom of any age. The snake chain is Sterling Silver and measures 18" long with a lobster clasp. The birthstone wheel contains Swarovski crystals in the accented birthstone color of your choice. These wheels are a wonderful way to create a wearable keepsake commemorating each of your loved ones. Size: wheel diameter: 1/2" across.