Eastern Bluebird Birthstone Bird. This little bird figurine sits atop a nest with a single egg in the color of that month's birthstone. The name of the month is engraved on one leaf and on the blue and white pedestal is written: The Lord bless you and keep you. December's Bluebird birthstone bird has a blue egg which is the color of Turquoise. And the little bird is the color of an Eastern Bluebird. Item number 4041994. Size: 4.13 inches high.