A number of interesting glass objects are also known from the 200 BCE - 200 CE "Jetavana Treasure," on which
see Hema Ratnayake, "The Jetavana Treasure," in Sri Lanka and the Silk Road of the Sea, eds. S. Bandaranayake et al.
Colombo 2003 (illustrated in figs. 4 & 5 on p. 43). Some of the other articles in the same volume may mention glass as well, though, in the absence of an index, one will have to peruse.