Old fruit knives silverplate and bone handles?

I think these knives are antique, they must have been beautiful in their heyday.  Unfortunately they have been sharpened so much that the silver plating has worn off most of the blades.    They still cut, as I found out when cleaning them!  There are remnants of floral decoration on the blades.   I dont know what the handles are made of.   Please look at the pictures carefully and dont hesitate to ask any questions.