4 crystal water cooler tumbler glasses black opaque hand blown curvy shape weighted bottom

Very simple, but very sharp. 4 black opaque crystal glasses have a curvaceous design with weighted bottoms. The ripples on the bottom tells me they are hand blown. Use for water, wine or whatever your poison.
There is a tiny scratch on one. I tried to capture it in the third photo.

Size: 3 1/4" dia. X 5" tall