Pate-sur-pate is, as far as I know, still being made in Russia.
Several years ago, both Bead and Button and Ornament had articles
about a woman who makes incredible pieces--she moved from Russian to
the US. I was trying to teach myself to make porcelain jewelry at the
time, so I was very excited, but I no longer remember her name and my
old magazines are far from here. She didn't appear on my simple
Google searches. Maybe somebody else remembers who and where she is.
Her things were pretty pricey--and for good reason.