Roy ............. Did you mean to say "The colour of the piece is clear and bright , does look appear to be grey as the urn vase does." - or is there a 'not' missing.

I think like most things you tend to 'get your eye in' after a while, and then possibly easier to tell the right from the wrong.
Most cut glass prior to about 1920 ish, doesn't really come with backstamps etc., so there's more of a need to understand styles of cutting, shapes, colour, seeds in order to help with origin - and even then rather hit and miss.
Collectors tend to like the history etc. that's behind Georgian/Regency glass, plus the lead coloured sparkle etc. and so the period has a sort mystique about it - to hold a piece that you know to be 200 plus years old can give a real buzz.
Pressed glass, imitating the cut equivalent, may well have killed off the previous volume of cut maerial that was being produced, and means that collector interest seems to fall away after c. 1830 ish, although I'm sure there was a lot of good cut stuff made during the mid Victorian period that gets ignored. You'll notice that most of the books include material only up to the end of George 4th's reign.
Think this is back to the old adage about buying what we like and enjoying looking at it, although it does need to be displayed well.
Do let us know if you get a positive response from Ireland, and we look forward to seeing Carol's finds some time
