What is repousse?

A method of embossing metal by stamping and hammering a design from the back to produce a three-dimensional bas-relief surface then polishing the front.

Cabochon - A cabochon is a gemstone that has been smoothly shaped and polished as opposed to being cut with flat facets. This usually results in a stone with a rounded convex top and flat bottom. Opaque gems, such as turquoise are often cut as cabochons, while transparent stones such as diamonds are facetted.