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The grain sort of resembles continuous uneven lines that sometimes you have to alternate the angle to see in the light...its really hard to describe, and differs depending upon which animal the ivory...

Hold it up to the light and turn it at different angles. Ivory will have a grain.

Alternatively hot pin test it - heat up a pin and touch an inconspicuous area. Ivory and bone will not melt,...

What is that one, a 7/8? Looks to be bone or celluloid - Ive never seen ivory that thick in scales that shape.

The hatching/criss cross on the tang is the same on my Hibbard Spencer, another...

Pictures would help alot. One picture says 1000 words