This film has been made for the Dutch National Museum of Antiquities in Leiden, as part of an exhibition about ancient jewelry. This is also the reason that it has no sound.
Coral btooch . 18kt , hollow .
Perhaps a more healthy way to polish with a micromotor. I made a container for the polish compound arround the dust exctractor (vacuumcleaner)
We show you how to bend the prongs over a one carat stone to make it look like it is set.