I don't know who did the vase, but the finish does not look scavo to me. Scavo is more erose. The finish on this vase looks smooth like it has been sandblasted or satinized in some fashion. The interior does not strike me as chalcedony, but I'm open to argument here. One thought I had on chalcedony is it is a difficult technique, so would be a shame to cover it on the outside (unless the technique turned out poorly, which I've read often happened).