It is a sempervivum, and possibly one you mentioned. (IIRC that name is a synonym for S. calcareum...) It is a very nice looking potful :) It will outgrow that container very fast, they form good clumps, easily over a foot in diameter.

There are about 50 species and more than 3000 named cultivars. On top of that, many are very variable. And, they hybridize very easily too. So it could be tricky to ID.

They are monocarpic - rosette that blooms dies.

Where are you going to keep it - indoors or outside? They are very hardy, most to z4-5 and some even z3.

GORGEOUS.