Hello,I have a Sempervivum (hen & chicks) rubellum 'Mahogany'.There may be an Echeveria 'Mahogany' you can always google images of it. Here's a picture of my Sempervivum 'Mahogany'
Here's 2 links for the Echeveria mahogany
Echeveria 'Mahogany'
If you want any information on hen and chicks there is a forum for sempervivums and jovibarbas,check it out.
I hope that helped you!!!