Two glass? beads

Pair of deep blue translucent glass(?) melon-seed shaped ear-drops, shaped like amethysts. If it is glass, the drops have been treated like stones, eg. cut and polished, though now both are dulled and somewhat battered. One is flat on one side with facetted edges very strongly marked, the other thicker. Both have been bored as if they were amethysts - bored from either end and the holes barely meet in the middle.If they are not glass, what? They have air bubbles! Only glass has air bubbles? Clearly if glass, they have been made from larger pieces already blown, eg. from broken fragments from those dark blue Anglo-Saxon vessels? If so, no indication in the texture of the glass. Possibly the drops were made specially for the purpose: if so the English(?) glass maker had no idea how to produce a hole in a bead int he normal way.