Jewellery is cast by making cylinder flutes that are filled with plaster surrounding the wax carving…then placed into an oven where the plaster hardens and the wax is drained out.
Once the wax is drained we pour liquid alloyed gold into the casting pot and with suction and centrifugal force the gold is injected into the empty plaster cylinder where the wax impression was.
The gold takes the form of the hallow impression the wax made. Once that happens the oven cooks it and it hardens. When it’s done you need to crack the plaster away and Voila: The gold version of the wax model has been cast.