What is unique to Shapeways' process of making products in precious metals is that the object is printed on a ultra-high wax 3D printer. The wax object is then used to make a mold in which brass or silver is poured. This is precisely how many professional jewelers make their designs and the smoothness is unparalelled.
The pendant has 2 cavities that fit 3x22.5mm tritium vials (3x23mm will also fit) without any need for cleaning the cavities. Barely visible in the picture above, the pendant also has 3 windows on each side in addition to the heart-shaped windows.