Many of the more modern Indian sets are camel bone - but pre-ban (and for a while afterwards) they used ivory quite a lot, as there would often be 'left-overs' from larger carvings. I did wonder about your set as, although I can't see any Schreger lines, there is some discolouration that can be typical of ivory.
Of course, just because its ivory doesn't necessarily mean anything, or greatly affect the value - in English sets, it often does, as ivory was a more expensive and less frequently used material, 'reserved' for the better quality sets, but that is not always the case where it is relatively commonplace.
Indian (in the sense of coming from Indian elephants, not necesaarily where the piece was carved) ivory has a different 'look' to it than the African variety - not so attractive to my eye, in general, but others may think differently.
