Old Stone Lamp

I have this old lamp I purchased at a Flea Market in Placerville, On the Antique Road Show it was showing a similar looking lamp that came over the Donner Summit, and I was wondering if anyone would know anything about this lamp. This lamp is made of some kind of Stone, maybe Granite. On the beveled sides are engravings of a flowers, very warn. On the Pedistal there are score marks. I haven't found any signature marks... But hoping someone might know about this kind of lamp