I am currently the Digital Coach for the City of London and the West, within the London and Midlands Region. My role in a nutshell is to coach our leaders on sustainable banking whilst making the lives our of customers easier.
(There is also genuine color-change sapphire which mimics alexandrite, as well as color-change garnet that can be a real fooler.). The first thing to do is check the refractive index of the stone, since each material has unique optical properties.
The hydrothermal process for making synthetic color change sapphires is all but unseen. It was done rather extensively by the Russians prior to the fall of the USSR. Back then, everything was funded by the state, and it was all about producing the best product possible in the research labs despite the cost.