French Jet Flat Stone Rectangle 22x10mm

These French Jet or crepe large rectangle facetted stones are  black glass or black crystal. (not fossilised wood). Manufactured from the late 1800s in the former Czechoslovakia using hand cutting techniques these beads are flat on one side and cut on the other with 2 holes drilled through them. They are extremely versatile. Mount them on filigree stampings, sew them onto garments and string them to create unique bracelets and chokers.
They have either the makers mark on the back with some have decorative etchings.The back is hollowed out and there are single holes are on all 4 sides.

Like all glass, it will be colder to the touch and heavier than Whitby jet or vulcanite.