Sempervivum ruthenicum. Light green rosettes, pink edges.
A lovely species - light green, slightly downy leaves incurved towards the centre of the plant. The outer leaves are attractively pink-tipped in summer giving a lovely, soft appearance. S. ruthenicum has a neat habit so it's a good plant all round.
Unusual too in that it has yellow flowers, unlike the more common pink/red flowers of other species and hybrids.