Sterling silver dichroic glass shop pendant on chain

Sterling silver, stamped 925.
Large piece of dichroic glass
90x30mm
Green ,pink and orange with other fiery colours showing through.
Hanging on shop a 16” curb chain.
In excellent condition

Silly fact.
Dichroic glass was invented by nasa, they were trying to make very strong glass for spaceships ,and discovered that the metals made it go pretty colours.