I'd typed this just prior to m posting..........so some of the information may now have been superseded, but I'll let it run.........
"quite probably, but the bottle more so than the chalice in my opinion, from looking at the pictures - the qualification being that the glass must replicate semi-precious stones such as onyx, agate, jasper, and of course chalcedony. My dictionary says it should be opaque, but when cut a little thin, most of these natural materials are sometimes translucent. I get the impression that the surface should be reflective (i.e. shiny) - the chalice looks matt from my angle. There are various web sites giving definitions - some with images."