In my humble opinion, this bead (it's shape and also the shape of it's perforation, from the little that I can see) reminds me of the re-worked Krobo glass fragment beads of the variety where often quite large fragments of old Venetian beads are being fused together to create a new bead.

In John & Ruth Picard's book "Millefiori Beads from the West African Trade" there are a number of beads very similar to Gabriel's: p23 # 155; p30 3rd strand from bottom up; p33 the elbow bead # 498; p52 # 1278; p56 bottom row; p85 #2800. ?