Same shape, different color and size...conical with 4 facets on each end...There is a similar bead with this beautiful necklace at the home page here, the small blue one I mean, so maybe Joyce will know, where this one comes from and what it´s age.

9 x 9mm the blue one, with 2mm opening; 15.5 x 14.8mm the clear one, with 4.7mm opening