Traditionally:

European (Judeo-Christian)
Bad luck if see hematite – to dream of hematite, denotes to obstacles and barriers the one will meet up while dealing with a tasks he has;
Distance between two if guy gives hematite ring to a girl – the dream in which the man gives the woman a ring with the stone of hematite, symbolizes the gap between two people. However, the one who will fix it, will be the girl who will receive the ring.

Hindu
Beware of evil if see hematite – the black color of the stone, warns of possible dangers.

Arabian (Islamic)
Poorness if dream hematite – the stone itself stands for the deterioration, therefore the dreamer might lose the richness he had.