Marble Columbus? What is this?

By Buckledownstudio, 16 November, 2013
Description

I found this in a box of items ranging in age from 1700-1950.  It is heavy and appears to be marble.  I have scratched it and it is definitely solid and is not laminated.  It looks like coumbus maybe?  I dont know what it is, what its worth, or who it is.  Any help would be GREAT. I tried looking up framed caemeos and havent really found anything like it. 

Category
Other
Medium
Marble, Cloth, wood frame
Distinguishing marks
None
Condition
Fair
Size and dimensions of this item
Frame is 8 x 10, marble portrait is 3x2
Weight
8 oz
History
In a box of other items from the late 1700's to early 1900's
Owned by a collector who was quite wealthy, a member of the free masons, and world traveler
For Sale?
No
Photos