Antique Amber or Glass?

by Debra
(Gig Harbor, WA)

I recently purchased a lot of some pretty nice antique jewelry. There is a 35 gram amber pendant with 14K gold chain and filigree work at the top of the stone. I'd like to know if its true amber or glass and maybe what the approximate value is. It measures 2 1/2" x 1 3/4"