I have used hematite triangles that are 18 x 16 mm, and hung them with 6mm semi-precious olive green peridot.
The result is an unusual pair of earrings that are really striking.
I have hung them on silver plated wires.
The earrings will be supplied in an organza gift bag.
The peridot used in these earrings is slightly paler than that in the complementary necklace: http://folksy.com/items/4415618-Olive-green-peridot-hematite-necklace