In this piece of jewelry, 3D means three dimensions: two different sides, i.e. two different pieces of jewelry, one side on the other day and the other side on the second day and only the selected side is visible .The third dimension is the interior high-fired ceramics  5.5 cm  length .The jewelry includes an adjustable leather strap and a silver-plated collar that are easy to change  according to the way I live. The jewelry box is a shade with jewelry!