After the wax tree is placed in the flask, a special liquid plaster called investment is mixed and poured over the tree to encase it all in plaster. A vacuum is used to remove any air bubbles from the liquid investment. Like the single mold of the original model, after the investment hardens, the wax is burned out, leaving a branching tree hole to be filled with molten metal.

The mold is placed in a vacuum chamber before it hardens to remove any air bubbles that could cause problems down the line. Once the plaster mold hardens and cures, it heated in a gas oven to melt out all the wax, leaving a hole in the plaster that is an exact replica of the branching tree of wax jewelry.

After the mold is hardened and burned out, grains of gold alloy, or mixture of gold and other metals added to it, are melted in a separate casting machine furnace. Most jewelry in the United States is 14k gold, with is a mixture of 58% gold with silver and copper. 18k gold is an alloy of 75% gold, also mixed with silver and copper. To make white gold, nickel or palladium is added to the alloy. To make rose gold, extra copper is used.

When the metal is the correct temperature, it is poured into the hardened plaster mold with the tree impression. Sometimes it is spun to make sure that the molten gold quickly fills the topmost branches of the tree, with every detail, before it starts to cool. After the gold hardens the mold is cracked and the golden tree is removed. Individual pieces are separated and sent for finishing.