A quick lesson on Chased and Repousse. These terms often confuse people interested in sterling silver. I hope that this will help explain the difference.
"Repousse" is a French word meaning "to push forward". And that is what the designers do with a Repousse pattern. The design you see is actually pushed out from the back of the silver. Instead of cutting into the metal to "carve" the design, the artist uses tools to push out the design from the back (or inside) to produce a 3D relief. The repousse technique gives a design a sense of volume. A prime example is Stieff Rose by Kirk Stieff:
Chased on the other hand is when the silver has been grooved or channeled or indented. But not to be confused with any type of engraving
Harold Newman in An Illustrated Dictionary of Silverware says “Chasing. The technique of decorating by handwork the front surface of an article of silver by indenting it and so raising the design (without cutting into the metal and removing any of it as in engraving), using a great number of differently shaped tracing tolls (‘tracers’) and a chasing hammer.”
An example of chased silver is St. Dunstan by Gorham: