.925 silver with patina for the mane and face.  Approx 1.5mm x 1.5mm (net wt. 2.3oz)  (sorry for the bad picture - this is one that I have been wearing for months - never taking off).  There is also a larger Leo approx. 4.5mm x 4.5mm (net wt. 8oz).
You can select with cubic zirconia or without.