This is officially my favourite Sempervivum and I think I can say that with no hesitation. Gorgeous silvery colour, velvety texture, thick leaves and compact rounded rosettes. Pictures online show an attractive red winter colour as well.
Sempervivum ‘Belladonna’
It was pricey at $8 (around a 5″ pot and beautifully grown so actually not a bad price) but I got a great deal (40% off) on this and another $5 Sempervivum (which “officially” “completes” my collection) I’ll post pictures of once I get some pictures that actually make it look good. It’s a bit of an Oddity.
All Andrew's Plants 
How neat! It looks like a pumpkin seed semp!!! LOL! Great find!
Thanks, I'm really happy with it, now I just need a place I can plant it where I can see it up close to really enjoy it.
Have you ever purchased a perfect single Sempervivum only to have it bloom before it has produced offsets? I blame this on the grower, who has separated the offsets before selling the mother plant. But it really sucks to buy a nice one only to have it flower and die and you are left with nothing. I hope this has not happened to you!
I came close a while ago, sort of. Fortunately it had produced one small offset which has now formed a tiny colony. Since then I've been moderately careful to buy only Semps with offsets already growing, even if they're tiny.
It's beautiful!!!