My vote is yes, it's a coticule. The grain on the purple/blue side is pretty tell tale of Belgians. It looks like a blue/yellow bonded stone instead of anatural from that odd seam in the first photo. Look at it from the side and see if it is two pieces glued together. MNost newer ones are glued to slate but many older ones were glued to blue. There are also naturally occuring blue/yellow homogenous stones, "naturals" that are hard to find now days.

Tony