I am Baffled by this Bead and think it is one of the Mali "Dug Beads". It is semi-devitrified, has red dirt or "rust" inside, and was with some of my "older" beads. But perhaps it is just an older Venetian that had been buried and not more Ancient?
It is still pretty, but hard to say exactly what the original colors were beyond white and greens or blue-greens?
This may end up on my eBay, not sure..
I am posting some Pics and also an Imgur Album- scroll down to see through album..
Thanks for any help, Anne
EDIT: Size is measuring ~15mm hole to hole X 12mm wide
Imgur Album: https://imgur.com/a/b5Dg9iz
Bead lover, collector since Age 15, semi-retired had wholesale/retail bead, folk art, tribal art store Lost and Found Gallery for 25 yrs. in DT Greensboro, NC