A spruce is connected to the wax model to create a pathway from the metal the cast item during casting. After, the casting items are cut from the casting "tree" leaving a small stem still (the spruce) attached to the cast item.
Jewelry Glossary
Spruce
More terms starting with S
Keep learning
Our education centre covers diamonds, precious metals, gemstones, and how to choose a ring in far more depth than a definition allows.