Champleve is a beautiful technique used in enameling where you create recess compartments or cells, in metal to receive enamels. These recessions can be achieved several ways. One grave out the area using gravers or chisels in any metals of enameling. Another is the use acid, which has been popular in the past few years, ferric nitrate on copper, sulfuric acid on fine silver or sterling silver. You place a resist on the areas you do not want removed such as asphaltum varnish, applied with a paint brush. And float the jewel in the acid. I prefer the metal to be 14 ga. and etch out about 1/4 the depth, to eliminate cracking as I do not counter enamel with this technique of enameling.
Coral from Enamel Works Supply as a great book out on etching metal for Champleve.
Relief Etching for Jewelers and Enamelists here is the link to her site,
Engraving takes some time to learn and the acids are a nice thing to avoid. My choice is to create a jewel in this technique using two plates of metal one, 16 ga. for the bottom and one 26 ga. for the top. The easiest metal in my option is fine silver. And fuse them together. It process is used in granulation buy adding copper to one of the sheets of metal.
The ring will act as a stop for the enamels, also creating the recession create champleve. The first image one part is plated with copper. The second image shows the pieces of fine silver fused together. You can use a torch or kiln.
The third image here I have soldered on a bail with hard sliver. And after graving out the background to add some sparkle , I laid in two thin layers of enamel, and polished.
Sharing The Beautiful art of Enameling Patsy Croft