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 crystals in the accented birthstone colour of your choice. These wheels are a wonderful way to create a wearable keepsake commemmorating each of your loved ones. Size: wheel diameter: 1/2 across. Add additional wheels for just $17.95 each.