thanks very much for the help Chris. - and I immediately looked for a 4.1/2" dome, but don't seem to have one - but do actually have a 4" one in Jade, which does of course fit. However, I'm surprised you mention the slightly larger size as might be difficult to hold the dome whilst putting it into the vase - very little, if any, room left for the fingers. Oddly, even the 4" one doesn't sit properly on the bottom of the vase. Anyway, it's a desireable item and nice to know it's a bit rare into the bargain. Paul S.