The rim has lasted 110 plus years and in very good condition so they must have been/be doing something right
I don't think it's ever been used. I'm not a fan of gold either but silver would look cheap I think
It's incredibly classy, I would say obviously given it's from Saint-Louis however they and Baccarat made a lot of stuff I don't actually like. It rings like a bell and goes on forever. Nice piece. £14.
I have no idea about the process. It has been discussed before but it seems to have been something that has never been done again I don't think. So however it was being made and whoever was doing it stopped doing it and the method died out with them I presume. It seems to be peculiar to Saint Louis and Baccarat and possibly Val St Lambert. Although I know we discussed whether my lampshade might have been Riedel as well.
It's a bit like the cloudy fluffy coloured glass made by Daum and Muller Freres etc.
Example here:
https://www.glassmessages.com/index.php?action=dlattach;topic=49289.0;attach=111325;imageI've never seen the technique used by anyone other than French makers n the 20s and 30s or since. I've no idea how they did it but it's beautiful.