The attached stone came in for new setting. Hadn’t given it much more than a quick look until today, as I originally assumed it was an amethyst. Top facets are worn down as I would expect. Was told this was possibly from the late 60’s or 70’s
As pictures it is obviously some type of doublet.
From top a light purple with a flash of pink.
From back a darker purple with blu flash around edge.
Chelsea filter shows red / orange.
Short wave give a blue white glow.
Long wave goes red.
Any thoughts on this ? What were they trying to simulate ?